why isn't my chaeto growing


New member
I've had chaeto in my sump for about 6 months now and it hasn't grown any. It's the same size it's always been. Is this bad? My tank seems to be doing fine.


New member
Mine never grew either, it's been six months since I introduced it and it is almost all dead now. I provided dirty water and lots of light.

My theory is that since I have so much Xenia and Macro algae in my display that those were exporting most of the nutirents leaving none for the chaeto in my sump.

I wouldn't get worried about it.



New member
Josh....You are growing Kelp for gods sake :lol:....I just looked at your site LOL.


New member
Do you have a light over the sump? I had the same problem for months until i changed the light bulb over my sump. I put in a 5100K PC floodlight 18 or 19 watts with 85watt equiv. and it's growing really fast. I think the original light i had was 2700K from HD. It's special order item at home depot but i think you can get it online.. i have the site somewhere. PM me if you want the link.


In Memoriam
Well I have the same problem, but what I am seeing is that cheato takes time to grow.

If you just put them in the fuge, its will be dirty and lot of dirt on it. Just leave it or clean it if you want too, about 2-4 weeks, when all the little guys ( fuge animals ) started growing, the cheato will be clean by it self and growing. I have 3 HOB fuges.


New member
I killed 3 batches of cheato before I found one setup that worked.

The 65W 6500 flood light did not work for me, I think it was too much light and cooked the algae into spaghetti. Raising it higher did not work for me.
Tried a 13W 10k PC light and a 25W fluorescent bulb and nothing happened for 2 weeks, the chaeto eventually started to break apart. Then finally got a "daylight" bulb from walmart, I think it is 13W. That finally seemed to do the trick. I have to trim the algae almost every 2 weeks now


New member
Try some Iron from Kent. It makes the cheato really grow well.
All plants need Iron to Photosynthesize


New member
I don't undstand why growing cheato is so difficult for some people. I think your tanks are too clean :)
I routinely give it away and all I have it is in my sump with a 100w bulb over it 24-7 and within a couple weeks it fills my sump.


New member
I have an old bulb I found under my bed, some 45w spotlight, It fills up the compartment of a 20g every 2 weeks after I trim it down to the size of a baseball.