Walt Smith

Project Reef Rock 2.1 Dry Rock

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No options of this product are available.

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.

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 a 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 herbivorous 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 handmade 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 handmade, 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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Product Questions

What is the best way to cure this rock for a new set up? I am purchasing the Red Sea 650 in the next two months and wondering if I should get a head start with the rocks. Would just like to know what the best process would be and duration for curing.

Question by: Doug Farlow on Feb 11, 2018, 10:29 AM
Hello Doug, this rock can be cured directly in your tank, or in a separate container. we usually just use 5 gallon buckets, or a brute trash can. You will want to throw in a heater and a powerhead with saltwater mixed to the right salinity. You will also want to add a food source for the bacteria to populate. Some common sources are ghost feeding (feeding as if there were one small fish in the water) or going to the deli and using a raw shrimp and putting it in nylons or some other kind of mesh bag for easy removal. It is definitely a great idea to start curing rock asap. As far as the duration that depends from tank to tank. You will want to test for ammonia, nitrites, and nitrates. You should see ammonia and nitrites spike and your rock is considered cured once ammonia and nitrites reach zero and there are readable nitrates in the water. At that point you will want to do a water change, but not before that. Hope this helps. Have a great day!
Answer by: Eric Bowman on Feb 14, 2018, 12:14 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 PM
Great question! This can be shipped to Canada, much like the Reef Saver rock! :-)
Answer by: Admin on Jan 9, 2017, 9:16 PM
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 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 on Jun 21, 2016, 12:02 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 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 on Mar 9, 2016, 4:28 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 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 on Mar 2, 2016, 9:35 AM
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 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 on Feb 19, 2016, 10:01 AM
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 AM
Great question! Its a pretty interesting story! I have included the link below.
Answer by: Connor on Feb 3, 2016, 1:34 PM
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 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 on Feb 3, 2016, 12:23 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 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 on Dec 23, 2015, 4:51 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 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 on Aug 24, 2015, 2:29 PM