I couldn't grow it either. Once I get a fuge LED bulb the stuff grows like wildfire.

My chaeto either most of the time floats or is about 2-3" below water surface. It litterly did not even grow 1cm since I bought it about 5 months ago lol. Still green as ever tho. I don't really check water parimeter much buy the last time I checked nitrate it was 15 because I expoxy some stuff in tank and my slimmer went nuts and overfilled and all the nasty stuff went right back into my system. This actually happened 2x lol then I did a water change a week after yes I know that's very bad lol. But all my coral and fish etc seem happy as ever. Next week I got some new LPS and did a revive dip and forgot to rinse it off b4 I it in tank and same thing happened to skimmer. My tank is normally 0-5ppm nitrate. How can there be litterly no growth in chaeto at all in this long period of time? Is chaeto not growing a bad thing?

Just did a nitrate test its at 20ppm lol damn. Gotta do water change now I guess =P. also why is high nitrate bad again? I don't see any coral dying or unhealthy I think.

Try a CFL 6500k phillips daylight bulb. This has always worked great for me. 13w or 27w is fine.

What's that bulb worth? More than $40ish?

Shouldn't be anywhere near that. Prob just available at home depot for a tenner. I have the bulb recommended by Melevs reef and it is a bit of an odd spec and that only cost $18 and that's pricey I'm told.

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Yes, for sure HD. Buy the cfl "daylight", thats the one with the 6500 K

+1 , two pack at Canadian tire for around $15

Doh
Missed the "daylight" part of Anthony's post

thanks i will try this =)