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
__________________
|