Cryptonemia Crenulata Red Marine Macroalgae Expand

Cryptonemia Crenulata


Cryptonemia Crenulata is a very rare to find macroalgae, which is a shame as it is with its thick branches and its deep red colour a real eye catcher in the display tank. This macroalgae is non-invasive and grows quite slow, which makes it a great addition for Nano-Tanks, Seahorse Tanks and planted reef tanks.

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£ 7.95

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Cryptonemia Crenulata Marine Macroalgae for the Planted Reef Display Tank & Refugium/Sump.
Live Algae UK - Clean Marine Macro Algae from Fish&Copper free tanks since 2014. Sustainable grown in the UK.


This macroalgae prefers low to medium light. Its deep red colour is best to reach with a lower lighting with a 6500k ( daylight ) light colour spectrum.

We haven't seen any interest in this algae whatsoever from any fishes or critters. So it can nice and slowly grow to become a centrepiece in your tank.

It will not attach itself, but it can easily be kept in place with some rubber band, superglue on rocks or similar.

Whitish parts of it should be removed as they are decomposing.

Like for most marine macroalgae a higher level of Nitrate and Phosphate, in addition to the supplement of Iron, Magnesium and Trace elements will improve the growth of this algae.

This macroalgae can be either placed in the Refugium where it would need an enclosed space or in the Reef Display Tank.  

Please note
Our macroalgae are from fish free macro algae tanks, although we use pictures for demonstration purposes only which will include fishes, seahorses and or corals. 
We do our best to quarantine, treat and remove any unwanted hitchhikers, parasites etc from our macro algae but we can not guarantee that the algae are completely free of anything unwanted, not limited to Copepods, Rotifers etc. This is simply because that sometimes eggs, spores, etc can remain viable but not visible and hitchhikers can still stay hidden, especially in dense algae structures, despite our strict quarantine efforts. 

All macro algae will be thoroughly dipped in a professional solution to deactivate hitchhikers as good as possible before posting. If you don't want this, please send us a message together with your order.

We highly recommend nonetheless that you properly quarantine anything new before adding it to your marine tank.

We aim to offer you the healthiest and best quality macro algae on the market, therefore, all of our macro algae comes with a 100% Satisfaction Guarantee.
The images on this page are for example only, actual product appearance may vary. 
Common NameRed Ribbon
PlacementRock (attach)
Growth Rate:Slow
Food Value:Not Palatable
Nutrient Uptake:Little
Flow Rate:Medium
ColourRed Macroalgae
Path: > > > Cryptonemia Crenulata

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We want you to be fully happy with your new algae addition. Therefore we offer you a hassle free Satisfaction Guarantee.  

If you are not 100%  happy with the macroalgae you received on arrival we will refund you the full money back *1.
We even will cover the return costs. The refund will be offered after we arrived and checked the returned algae.

*1 = Valid for UK Orders only, please see our Terms for EU orders HERE 

Top Quality Macro Algae Guarantee

We offer you marine algae from our mature macro algae mother colonies in a premium quality & 100% healthy. Sustainably grown in the UK.

All macro algae we sell will be normally heat sealed and wet wrapped when posted to you, protected in a small box which assures that it doesn't get damaged while in transit. 

Best Price Guarantee

We won't be beaten on the Premium Quality of our Macroalgae cultures, and surely not on the price either!

Have you seen the same macro algae somewhere else cheaper?

Please just send us a message HERE and we will check your request within 24 hours ( working days only ).

When we can match the other price we will send you a discounted offer which will be valid for the next 7 days after receiving our email. 
This offer will be just valid for purchases using the email address provided before.

The price match offer is only valid for identical, same size/amount and available macroalgae species.
As a proud UK based tax paying business, we don't price match any offers against auction sites or from private sellers.

The price match offer is just valid for UK deliveries. We reserve the right to refuse a price match request.

If you have any questions please don't hesitate to contact us, please.

Your Livealgae UK

Livealgae UK

Send us your question

questions Charles on 05/07/2019

Hi. I’m setting up a 200 litre tank currently to keep my erectus seahorses in. The base is approximately 2 foot by 2 foot. Please could you recommend some Macroalgae suitable for this tank, and how much you think I should buy. I’d love to say it’s going to be a low nutrient system, but realistically I always struggle with nitrates in my tank. I’d also prefer not to have Caulerpa, or anything in danger of going sexual if I don’t keep it trimmed.


Hi Charles.

What temperature are you looking for to keep the beautiful seahorses in?

We recently had another customer and I believe he was going to keep a temperature of around 21C.

When this is the temperature you are aiming it is a bit harder for macroalgae, as most thrive best in temperatures between 24-26C.

The best results from the feedback we have received are more slow growing algae species like Cryptonemia Crenulata 

or Codium


All are more hardie species, but not nearly as fast growing as a lot of Caulerpa species, therefore with no isk at all of them going sexual. 

We have a new red bubble algae as well, but no experiences with lower temperatures yet. 

I hope this helps.

Kind regards

Livealgae UK

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Total rating:
0 1 2 3 4
Based on 12 reviews
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0 of 0 people found the following review helpful
Posting:0 1 2 3 4
Quality:0 1 2 3 4
Service:0 1 2 3 4
Total Rating:0 1 2 3 4

faster delivery and well packaged

0 1 2 3 4

Cryptonemia Crenulata

0 of 0 people found the following review helpful
Posting:0 1 2 3 4
Quality:0 1 2 3 4
Service:0 1 2 3 4
Total Rating:0 1 2 3 4

Beautiful algea. Some parts of it didnt survive all the way to Sweden but it was a good portion left after triming of the bad parts. Big bonus is that my tangs doesnt show any interest in it. Will order again!

0 1 2 3 4


1 of 1 people found the following review helpful
Posting:0 1 2 3 4
Quality:0 1 2 3 4
Service:0 1 2 3 4
Total Rating:0 1 2 3 4

Plant arrived in great conditions looking forward to buying more later. Thank

0 1 2 3 4


0 of 0 people found the following review helpful
Posting:0 1 2 3 4
Quality:0 1 2 3 4
Service:0 1 2 3 4
Total Rating:0 1 2 3 4

Good seller good communication and quick delivery +++++

0 1 2 3 4

Great service and macro algae :)

0 of 0 people found the following review helpful
Posting:0 1 2 3 4
Quality:0 1 2 3 4
Service:0 1 2 3 4
Total Rating:0 1 2 3 4

Order arrived a bit later than expected but they messaged me about this.
The macro algae look well and are now hopefully doing well in my tank.

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