Keeping Chaetomorpha

Par38 led at 5000k color temp is what I use, I keep mine in the overflow side so that it gets its flow that way conning out of the drains, it's always been happy and grows well, I just grab a hand full , rip it off and throw the rest away come trimming timec
 
I kept the light on mine 24/7. Whenever it got out of hand I'd throw some to the tang. I'd take a handful probably 2x a week but I kept about a melon size ball of it going.
 
how often do you trim it and did you run the light reverse photoperiod?
I use the reverse photoperiod method, to attempt to balance of the pH. I can't say there's been a specific time for trimming, maybe ever 2-3 weeks. I think it depends on your nutrient levels and size of your sump
 
Keep mine in fuge area with a small 300gph power head blowing down at it, between the current at the surface and the power head it tumbles constantly. I start with a baseball size chunk after trimming and end up with a basketball size after a month or two. Because mine is spinning, I get a tighter clump so it is really the size of a large watermelon. Run my par 38 5k led from 9pm to 3am.
 
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