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I keep Grape calerpa in mine but I hear that it can go sexual. To keep it from clouding up your tank I run my fuge lights 24/7 and keep it pruned back by feeding to my tangs.. I `ve never had mine mess up but I`m knocking on my head pretty hard right now.
i have Chaetomorpha in my refuge....i cant complain about it. i have it under 2 19 watt 6500k flourescent screw base lamp( equivalent of a 75 watt lamp) from lights of america and put it in a clamp on holder to focus on the refugium. the bulbs were about 10$ from home depot and the clamps were around $5. from what ive experienced the chaeto grow crazy under this bulb. hope this helps