#ed_op#DIV#ed_cl#I have a 58 gallon oceanic with about 58 lbs live rock with a ecosytem for a filter. I started the tank about the 1st of September. I have a yellow tang for the last 1/1/2 weeks and is doing fine. About 8 days ago I bought some coral and a corallife lite for the tank. I keep it lit for no more than 10 hrs /day. My sp gr is 1.024; Nitrate 15 temp 76; no ammonia. 2 days ago I noticed brown gunk growing on the live rock it has spread to the sand and is starting on the walls of the tank. The eco system has red slime on the walls of the filter with the macroalgae cauleupera(spelling?) . Is the lite causing this? What can I do? The yellow tang and coral are doing OK. The brown lite gunk looks disgusting#ed_op#/DIV#ed_cl#