ARC Reef

8oz Purple Helix Coralline Algae

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There is No Faster Way To Turn Bare Rock Into Beautiful Coralline Encrusted Live Rock!

Purple Helix Coralline Algae is a truly unique product that contains multiple species of live coralline algae spores and nitrifying bacteria in a single solution. Unlike many other coralline algae accelerators that are mostly just calcium and other elements, ARC Reef's Purple Helix contains live algae that will populate on your reef tank's surfaces to create a vibrant purple crust over your rocks. Coralline algae has multiple beneficial effects for your saltwater aquarium, from discouraging nuisance algae growth to providing a habitat for beneficial bacteria and other microscopic creatures. Pairing Purple Helix Coralline Algae with Pink Fusion will give your tank a very natural coralline algae look much quicker than any other method. 


We recommend using 8oz of Purple Helix Coralline Algae per 50 Gallons

  • Unique 2 in 1 formula contains both live coralline algae spores and active nitrifying bacteria.
  • Every bottle includes 7 separate species of coralline, this maximizes the color variations and varieties that will populate throughout your tank.
  • Purple Helix blend algae strains are highly epiphytic stains that will help to outcompete other nuisance algae and diatoms.
  • Effective in improving water quality by controlling ammonia and nitrite levels.
  • Aids in rapidly establishing your tank's biological filtration using fresh multi-strain bacteria bottled on the day that it is shipped.
  • 100% all-natural formula. No sulfur, copper, or phosphates.
  • The highest concentration of beneficial nitrifying bacteria which remove harmful nitrogenous waste.
  • Establishes a natural organic balance in your aquarium.
  • Helps cycle new fish tanks and eliminate new tank syndrome.
  • Safe for use in all reef tanks and with all species of fish and coral.


Special Note - Purple Helix from ARC Reef is bottled fresh and never sits on a shelf for more than a couple of days, at the most. Since it is a live substance, it is necessary to use the contents within 14 days of the bottling date that can be found on the side of the bottle.



Use when setting up a new aquarium, when adding new rock or substrate to your tank, and to boost the color and diversity of existing live rock.
Entire contents must be used by the expiration date printed on the bottle. Every order is bottled on the same date that it ships.

For saltwater use only.

1 8oz. bottle treats up to 50 gallons. If your tank is more than 50 gallons it is recommended to use 1 bottle for every 50 gallons of tank volume. You cannot overdose your tank with this product.


Most reefers will start to see colored spots appear within a couple weeks however it can take up to 3 months before effects can start to be seen. Coralline algae does not grow super fast and patience is a virtue when it comes to any saltwater aquarium, but making sure that your tank parameters are in the correct ranges and steady can help accelerate the growth (see tips below).


Types of Coralline Algae Included with Purple Helix:

Hydrolithon, Neogoniolithon, Porolithon, Lithophyllum, Lithoporella, Sporolithon, and Hydrolithon sp.


Ingredients - Purified seawater, lab-cultured coralline algae spores, nitrifying marine bacteria (heterotrophic, chemolithotrophic and autotrophic), calcium carbonate, potassium carbonate ion buffer.


What's Included?

1x 8oz Purple Helix Coralline Algae



Raise your Temperature. Coralline algae grows very slowly, its growth rate is approximately 10x’s more rapid in tropical waters than in the Arctic. If the temperature of your tank is below 78 °F. then increase the temperature to 78-82 °F. this will increase the reproductive growth rate by nearly 15% Make sure to keep the temperature stable with a heater controller.

Aquatic Life Loves Stability and so Does Coralline Algae. You must keep your water parameters stable through regular monitoring and water testing. Smaller more frequent water changes are preferred over larger less often water changes, this helps eliminate any shock to the spores. Salinity and PH are the 2 most important parameters to keep stable.

More Frequent Water Changes. You should be doing regular water changes at least twice monthly. Nearly every problem can be fixed with a water change. High nitrates? Water change! Cloudy water? Water change! Nuisance algae? Water change! Got ick? Water Change! Are corals shriveling up? Water change! Spending all your money on corals? Ok, well that’s one that a water change can’t fix but for nearly everything else, a partial water change will fix, or at least give you more time to find the problem. Your aquarium is a closed system and can easily be put off balance.

Have Patience. If you’re new to the hobby this tip will save your hard-earned cash from being flushed down the drain. Only bad things happen overnight in this hobby. Add livestock slowly and never change anything quickly. It’s best to think of your aquarium like a very old man, it doesn’t adapt well to change (and at times can smell like an old sock!).


AlgaeBarn's Alive on Arrival (AOA) Guarantee!

AlgaeBarn takes all the worry out of buying live copepods and phytoplankton online by going above and beyond to take care of their customers.

That’s why they guarantee every order we ship will be 100% Alive On Arrival or they will replace it free of charge. They will even cover the shipping on the replacement.

When your order arrives, be sure and inspect the contents to ensure everything is looking alive and well before you add them to your tank or put them in the fridge. AlgaeBarn gives 12 hours after delivery to make sure you are completely satisfied. If for any reason you decide something isn’t quite right, simply snap a photo of the unopened item(s) you would like replaced. Be sure to get the expiration date on the back label in the photo. After that, visit www.algaebarn.com/claims and submit the form. They will review the photo and have a replacement out for you faster than a six-line wrasse at feeding time. Once your replacement order is processed, AlgaeBarn will send you a brand new tracking number automatically.

So start giving your tank the love it deserves and order with confidence knowing that AlgaeBarn has your back.

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Product Questions

Just purchased your desktop pick tank. What dosage of the 8oz coralline do u recommend
Question by: Jerry Fickey on Jan 23, 2023, 7:37 PM
Thanks for the question! I would recommend one bottle of the coralline algae.
Answer by: James Johnson (BRS Staff) on Feb 9, 2023, 10:37 PM
Can I add this if I have fish in the tank?
Question by: Joseph Maguire on Oct 21, 2022, 7:35 PM
Yes! this is fully reef safe.
Answer by: William Reed (BRS Staff) on Nov 2, 2022, 1:45 PM
I've got 2-3 months before I set up my tank. Would this be OK to start cycling my aquascape dry rocks in a bin?
Question by: Gary F DeFazio on Jun 20, 2022, 7:31 PM
Coralline does need light in able to grow so I would not recommend this for pre-cycling rocks. This would be more ideal to add to the aquarium around month 2-3 once your lighting has been turned on.
Answer by: Ash Hoglund (BRS Staff) on Jun 22, 2022, 10:20 AM
When is the best time to introduce coralline algae to a new tank?
Question by: Sean Carson on Mar 9, 2020, 11:34 PM
Hi there,

You would want to wait to introduce it until after you start dosing a calcium component for your corals.

Take care
Answer by: Thomas Billington on Mar 11, 2020, 2:40 PM