Project Reef Rock 2.1 Dry Rock - Walt Smith

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Quick Overview

Available in 3 different volumes:

11lb - Great for pico and nano tanks. Rock sizes can vary from small baseballs to small footballs

22lb - Great for nano tanks. Rock sizes can vary from small baseballs to large footballs

55lb - Great for nano and larger tanks. Rock sizes can vary from small baseballs to small soccer balls

ReefRock 2.1 is a dry rock that should be cured before use.

  • Quick Overview

Available in 3 different volumes:

11lb - Great for pico and nano tanks. Rock sizes can vary from small baseballs to small footballs

22lb - Great for nano tanks. Rock sizes can vary from small baseballs to large footballs

55lb - Great for nano and larger tanks. Rock sizes can vary from small baseballs to small soccer balls

ReefRock 2.1 is a dry rock that should be cured before use.

Project Reef Rock 2.1 Dry Rock - Walt Smith

57% Recommend this to a friend (17 of 30)

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Choose a size

5kg (11lbs) Project Reef Rock 2.1
SKU: 209194

reg. $59.99

Special Price: $50.99

10kg (22lbs) Project Reef Rock 2.1
SKU: 209195

reg. $99.99

Special Price: $84.99

25kg (55lbs) Project Reef Rock 2.1
SKU: 209196

reg. $229.99

Special Price: $195.49


Full Details

We recommend 1 pound of rock per 1 gallon of display tank volume for the average aquascape. Depending on the tank you may like more rock or less rock, however we would always recommend ordering a few more pounds of rock than you may need, as any extra rock can always go into your sump for added filtration.


REEF ROCK 2.1 is the dry version of the live rock that is ready out on the market today. Walt Smith has noticed that the popular designs and other products are being sold as decorative rock even though it is not quite live yet. When mixing this rock with a few pieces of established live rock your tank will get the benefit of both worlds. It’s possible, given the current trend, that this type of rock could dominate the market in the next few years. If so, Walt Smith is ready!

With rock that is already covered in what looks to be coralline algae it will allow a new tank to look seasoned in just a few weeks. Here at BRS we have set up a couple tanks with Walt Smith's new Reef Rock 2.1, and have really enjoyed the look that it gives, as well as the unique shapes of the rocks, and porous internal structure. We have found that over time with herbiverious fish and invertebrates that pick at rocks that they may pick through the purple coating on the rock, however over time live coralline algae will cover those areas.


When you think about it, this rock actually becomes better than the wild choice and brings a truly sustainable solution to our hobby.


Reef Rock 2.1 is manufactured by mixing reef substrate, that is a mixture of sand, coral pieces, shells and more, with a cement mixture allowing natural textures and shapes to be created. The reef substrate mixture allows the rock to have a porous network within the rock giving it many of the natural characteristics of rock straight out of the ocean.

After the rock is hand made it is then cured for 6 or more weeks allowing the cement and reef substrate mixture to fully harden and neutralize before it has a thick coating of purple, reef safe, paint applied around the entire exterior of each rock.


ReefRock 2.1 is a dry rock that should be cured before use. 

As with all of the ReefRock products the rocks colors will vary from Coraline pink to deep purple.

With each rock being hand made, a variety of rock will be in every box. We are unable to guarantee any specific sizes or shapes.


The UPS automation is not always gentle on heavy products like this and they do not consider this product insurable. Because of this, there is some inherent risk with shipping rock like this across the country and it is impossible to replace or refund broken pieces. If this happens most pieces can be repaired with epoxy.


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  • Really great. Not sure what everyone is complaining about. By Kaietan on 9/14/2017

    Possibly not as porous as some of the other rock but I keep some other types of rock in the sump so that doesn't affect me. As for the flaking I didn't see any... Leaching either... have no issues at all with this rock. Actually really love the variety I received. Only complaint would be price but I knew that when I bought it.
  • Not Porous! It's just Fake rock made of Concrete and Paint ! By Steve on 8/17/2017

    I AM Very disappointed with my order of the Walt Smith Rock . Decided to risk ordering it based on the poor reviews and boy were they right. The Paint completely covers the rock and ruins any hope of porousity and biological performance . The coloring on the rock does not match and the PAINT they used chips off very easy. My PH and phosphates are way too high for just setting up a new tank. Many rocks were broken due to the poor packaging. I regret not just ordering another type of rock.. The last few positive reviews are very misleading as they gave me some hope for ordering. But they look and sound as though they were written by the company as well to try and cover up all negative reviews that's all over the Internet about the problems with this rock. Buyers BEWARE!
  • best reef rock By fish girl on 8/14/2017

    I love the Walt smith reef rock 2.0 ,when I opened the box I loved the color it looks so natural and all the different sizes and shapes really made my aquascaping so easy. it did leach anything in my aquarium and no color loss in the rocks. We have used this rock for years and lots of success from it. I encourage all to try it !!
  • Highly Recomended By Bulfraw on 8/8/2017

    We have been using this rock for years, the color fades as it ages and looks like the old school Fiji Rock from 15-20 years ago.
    My 120 G display looks amazing and I get comments on the rock almost daily.
    Great substitute for Natural rock!!!
  • Very happy By GAZ on 8/8/2017

    I have used this rock for some time now and whilst there were some bad reviews on the earlier versions, I can say that the 2.1 has been great! I filled a container with it and left it for a month to see if the phosphate issues were true, and could not detect any phosphates, high PH or other problems with the water. Excellent product that I will be using again in the future!
  • Still leeching PO4 2 months later. By Reefahholic on 6/4/2017

    I'm really getting annoyed with this rock. I've been knocking the PO4 down almost daily to find it back up again the next day. It has been at 0.20 - 0.50 and just not stopping. My tanks never run that high. My target is 0.05 and even with consistent Lanthanum Chloride treatments, I can't get it there because you have to go slow. Can't drop it more than 0.5 to 0.1 in a day. If I go 0.15 or higher... my anemones will deflate or walk. Save yourself the headaches. Get some Pukani or Marco rock.
  • Don't know yet By Billy on 4/29/2017

    Was wondering if anybody has experienced high calsium with this product I can't seem to get it down have had it for 2months now and my calsium is still in the 550 range any suggestion on how to get calsium down have down 3 water changes in the last 2 weeks to no help .?????
  • Meh... By Randall on 4/15/2017

    I bought this because of the 52 weeks series. "What a neat idea" I thought. I regret it mostly. It has been flaking off since I filled the tank, It doesn't really look all that good in person, and it doesn't appear to be all that porous. Some of the surfaces actually have so much paint on them that they are smooth. Wish I had gone with the Caribsea equivalent, or Real Reef Rock. I guess the only plus side for me is it's pest free. Now, if I find out it actually is leeching PO4, I'm gonna be P.Oed.
  • Rock is peeling, from day one By BRS Denied a Return on 4/12/2017

    I have had other orders go smoothly, and I order a ton of bulk items for my coral farm. Bought a 25Kg box of this rock, and there were strands of what looked like monofilament everywhere, and I mean on every side of every rock. To add, my tank was full of purple flakes and bare spots on the rock. So in essence, I had streamers and confetti; not the party I was hoping for. The worst part is BRS's denial of a return, regardless of me paying shipping. The BRS reputation is turning sour. Good luck to the rest. i will not order again.
  • Leeches phosphates By Reefahholic on 4/8/2017

    Don't buy it. It looks great, but leeches PO4. It does flake and pieces of the rock float around the tank. My PO4 has consistently been over 200ppb with Hanna ULR. Check out my YouTube video about it.
  • Great looking rock that is easy to aquascape with By rsepiphyte on 2/18/2017

    This rock look naturalistic and is very easy to work with. I have been using the Zeovit system with it along with marine pure and have not had any algae outbreaks or other problems with you. Love this stuff!
  • A+ By Daniel on 1/26/2017

    I read all the reviews before I bought this. I have to say most of them are right.. There are two different colors of rock.. Some of the paint chips off, not much and I "cured" mine in heated circulating water for a couple weeks and most happened in there.. I had a couple broken pieces, easy to fix..
    But that being said, with a little work and preparation it looks great in the tank.. No pests.. aquascapes very nicely... No phosphates leaching..


Ask a question

Product Questions

Another follow up question - to Dave's question. After curing in your tank with only water and sand - is a water change needed after the curing is complete?
Question by: aaron on Jan 25, 2016 2:43:00 PM
Great question!
It is recommended to perform a large water change or series of changes to remove nearly 100% of the water. The reason being is to remove nutrients before starting the cycle. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Feb 3, 2016 12:23:00 PM
OK who is this Walt Smith guy? I see his live rock advertised in so many places.
Question by: Jake on Jan 26, 2016 11:44:00 AM
Great question! Its a pretty interesting story! I have included the link below.
Answer by: Connor (Admin) on Feb 3, 2016 1:34:00 PM
I am wondering if this needs to be cured, or if it is free of any contamination... is this even real rock or is it imitation Thanks.
Question by: Christopher on Aug 21, 2015 8:54:00 PM
Great question!
This rock is man made and hand painted to replicate coraline growth. The rock will still need to be cured however to ensure that the nitrifiying bacteria has time to appear on the rock. If placed directly into a system there is potential for algae growth on the rock if lights are on and a pH swing may occur.
Answer by: Connor (Admin) on Aug 24, 2015 2:29:00 PM
The description on this rock states that the purple color is throughout the rock but reviews seem to state otherwise. Which is it?
Question by: Todd on Mar 6, 2016 6:43:00 AM
Great question!
This is essentially man made concrete rocks which are painted over. There certainly will not all be 100% purple covered however in our experience we have found this to be a great rock to aquascape with, and after a few months in the tank the rock is very natural! The same experience can be had with many other types of natural dry rock. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Mar 9, 2016 4:28:00 PM
As a follow up to Christopher's question, this rock would be going into a brand new setup. Right now there is just water and sand in the tank. Would you suggest keeping the lights off while the tanks cycles to minimize the potential algae growth you mentioned?
Question by: Dave on Dec 17, 2015 11:38:00 AM
Great question!
We highly recommend keeping all lights off and the tank in a dark room with limited light penetration to reduce any possible algae growth which may occur with the excess nutrients. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Dec 23, 2015 4:51:00 PM
Can this type reef Saver 2.1 rock be shipped to Canada like the reef saver rock?
Question by: Michael Miller on Dec 30, 2016 6:02:00 PM
Great question! This can be shipped to Canada, much like the Reef Saver rock! :-)
Answer by: Admin (Admin) on Jan 9, 2017 9:16:00 PM
Is there anyway I can but this rock by the individual pound? Because I only need 2 pounds of it.
Question by: Chase C on Feb 1, 2016 8:04:00 PM
Great question!
Unfortunately we are unable to split up the packages on the project reef rock. At this point a rock such as reef saver sold by the pound may be a better option! Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Feb 19, 2016 10:01:00 AM
There seems to be a lot of confusion as to what exactly this 2.1 rock really is.

Your site states that it is covered with a thick purple paint - is that correct?

Is the rock solid purple through and through?
Question by: G on Jun 21, 2016 11:41:00 AM
This rock is hand painted and while small sections may be left intentionally blank this rock is nearly 100% purple covered with varying shades. Feel free to let us know if you have any further questions.
Answer by: Connor (Admin) on Jun 21, 2016 12:02:00 PM
I need bigger pieces for my tank. Does the 55lb box have larger pieces in it than the 22&11lb boxes? For example would the weight of the largest piece in a 55lb box weigh more than the largest piece in a 22 or 11lb box?
Question by: Steven Ratka on Feb 4, 2016 8:57:00 PM
Great question!
The 55lb box will not have larger pieces rather the same size but larger quantity. Overall the average size will be around a football. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Mar 2, 2016 9:35:00 AM