I have a 2.5 gallon fuge with a corallife two 9 watt bulb pc fixture which has two 9 watt 6700 k bulbs in it. Bulbs replaced three weeks ago. My cheato grew good for the first few months it was in my fuge but now it has basically stopped growing. My parameters are all very good and kept that way by a dosing pumps. Ca 440, Alk 9, Mag 1450, Phosphates always test 0, SG 1.025. I have a phosp reactor with phosban, protein skimmer, 29 gall dt, 10 gall sump, ato. All livestock in tank looks good. I did notice from pics on here that my cheato looks bigger than most others, larger diameter. It does not clump into a tight ball like everyone elses. Lately it has not been growing at all. I was thinking maybe not enough flow, lights may suck or my filtration is just removing too many nutrients from the water.