Chaetomorpha linum Chaeto Marine Macro algae Expand

Chaetomorpha Chaeto Linum


Chaetomorpha or just Chaeto is a perfect nutrients export marine macro algae species. Often placed in the the sump it is non-invasive and fast-growing algae, which is very easy to care for. This Chaeto species is not palatable, but the main purpose it does very well, reducing the Nitrate and Phosphate levels in the aquarium water.

We have a palatable Chaeto species as well HERE

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Chaetomorpha Chaeto Linum Marine Macro Algae

The  Chaetomorpha / Chaeto marine macro algae love the light, as more as you provide as faster it will grow.


This Chaeto algae species is not palatable and we would not recommend to add it to your fish tank display. As especially Tang Fishes might try to eat it, but can't digest it.

Chaeto algae species are not invasive and they won't attach themselves. A great choice for the refugium for nutrients export.

Whitish parts of it should be removed as they are decomposing. But Chaeto is a very stable macro alga, so this should hardly happen.

Like for most marine macro algae 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.

Chaetomorpha Linum Variations
Chaeto Linum - or often called Spaghetti Algae - are a loosely entangled group of macro algae species which are non-invasive with unbranched filaments usually between 3 and 40 cm  long.  The colour of it is varying between dark green to bright or yellowish green. It occurs in various diameter sizes ranging between 0.2 - 2.5mm.

We have a few different Chaetomorpha Linum species available but classify this non-palatable macro algae Chaeto mainly in a very thick Chaeto group, which grows medium fast but is therefore more tolerant to low nutrients in the water and where nutrients remover like Rowaphos, Carbon, Nitrate remover or other water polisher are used. and a medium thick Chaeto group which grows much faster and is therefore our recommended choice for nutrients removal. As it grows very fast it will need sufficient Nutrients to stay stable and might suffer or die off when necessary nutrients ( especially Nitrate and Phosphate ) are very low or where nutrients remover like Rowaphos, Carbon, Nitrate remover or other water polisher are used. If you prefer one of them please let us know. We recommend for Chaeto as well to maintain good Magnesium levels and dosing of Iodine and Iron.

Please note
Our macro algae are from fish free macro algae tanks, although we use sometimes 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. 
Scientific NameChaetomorpha Linum
Common NameChaeto / Cheato or Spaghetti Algae
PlacementRock (attach)
Growth Rate:Fast
Food Value:Not Palatable
Nutrient Uptake:Very good
Flow Rate:Medium
Light:Moderate to High
ColourGreen Macroalgae
Path: > > > Chaetomorpha Chaeto Linum

100% Satisfaction Guarantee

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 Kelvin on 02/04/2020

I have ordered some cheats from you! I’ve now just gone to place a order on some supplements as in chaetogrow to benefit and kickstart the algae it but can not find any anywhere? Do you have any idea where I could find some that is recommended?? I was going to order Brightwell cheato grow but doesn’t look like it’s available in the UK!


Good Morning Kelvin.

I am sorry but I do not know where you could source this. We use the line from Red Sea Trace Colours with great results. What they mainly will need to grow though is Nitrate, Phosphate, with good Magnesium levels and some minor minerals which you should have normally with normal water changes enough in your tank. Iron and Iodine may be beneficial to add too, especially when you have a larger amount of macro algae in your tank. 

Please be aware that if you use Rowaphos or Carbon that those can cause problems as they will remove some minor minerals unfortunately too which some macro algae will need to grow. I hope the Chaeto will grow well in your tank and should you whenever have a question please let me know. Please stay safe and well.

Manfred Livealgae UK

questions George on 28/03/2020

Hello i have question, in your facts and care instructions of the algae it shows food as palatable or not palatable. This is meaning whether the fish like to eat it or not right? Thank You


Hi. Thank you for your question.

Yes that just indicates the fact of if it is edible or not for fishes and critters.
Please notice that all of our algae are not suitable for human consumption though. Just mentioning this as we got requests for this lately :)

Have a nice day and please stay safe and well.

Kind regards

Livealgae UK

questions Scott on 27/03/2020

Looking at your chaeto and looking at the sizes can’t image the sizes in my head how much would you say the 275ml is in hand size is it a small handful, a handful, or or a good handful. Or more


Hi Scott and Thank you for your question.

The 275ml is a very good hand full I would say. When posted with the free delivery - currently suspended due to Covid 19 - we compress it and post it without air, so it will look less, But once back in the water or "hand" you won't be disappointed. Hope this helps.

When you have any further questions please do not hesitate to contact us.

Kind regards
Manfred - Livealgae UK

questions Chris on 21/02/2018

I bought some of your Chaeto which sunk to the bottom of my refugium. Now most of it is floating with air bubbles on it, I'm wondering if that's what it does when it starts to grow?


It could be a sign of having micro bubbles in your system maybe. Simply shake the chaeto to remove the bubbles, and attach it to some piece of rock or similar to keep it down.  Maybe you can find as well a way to reduce the micro bubbles in your sump? 

questions Ben on 13/12/2017

Can I use this in my fish tank, as I don't have a sump?


Hello Ben. Yes, sure you can use Chaeto in your Tank Display. It won't attach itself and is therefore safe to use. Although we would recommend more prettier macro algae to use in the Tank Display. Especially like the Blue Ochtodes, it looks much nicer and fishes love to nibble on it. It will attach itself, but it isn't spreading like Caulerpa macroalgae and without possible problems, as we described in the Caulerpa CASE,

Maybe you can use it in your overflow instead when you have there light too?

BTW: When we had it in our private tank our Tang tried to eat it and as he couldn't digest it, he was for a day a bit uncomfortable.


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Total rating:
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Based on 26 reviews
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0 1 2 3 4

Perfect for my new algae reactor

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

More than enough for seeding my new algae reactor. Arrived well packaged, nice and clean.

0 1 2 3 4

Excellent just what I wanted!

0 of 0 people found the following review helpful
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Arrived very quickly in excellent condition (even considering the heat

0 1 2 3 4


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

I am very pleased with this Chaeto order which was delivered quickly and I was informed constantly on the delivery status. Super clean and in perfect condition. Thank you very much.

0 1 2 3 4

Excellent Service

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

Excellent service, good amount of algae for price!

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
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Total Rating:0 1 2 3 4

Amazing quick service. Good size of algea. Very recommended. Thank you

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