Too much light?
by
, 10-13-2010 at 01:52 PM (1746 Views)
Ever since I upgraded my tank from 2x55W PC lights, to 4x54W T5's my finger leathers, toadstool and various mushrooms and even my Zoanthids have been slowly dwindling! The finger leathers almost never extend polyps anymore and have shriveled up to half their original size, the Toadstool only opens it's polyps at night, and slow retracts them after the lights come on. And my mushrooms are slowly dissappearing! My Zoanthids have great colors, but are not spreading, in fact the colony has been shrinking. On the other hand, my LPS corals are growing like gangbusters, and have wonderful extention and colors. And I have a little tiny patch of monti (1/4" or less) left from a colony that bleached last spring that seems to be growing quickly.
Could it be too much light? Or should I be looking for other causes? My Nitrate and Phosphate are undetectable, I keep Alk between 8 and 9 dKh and CA right around 400. So I don't think it's a water quality issue.