I have 2 50/50 coralife bulbs which I leave on from 7pm to 7am everyday. Inhabitants include Lrage hippo, emperor angel, 3 clowns, and a small powder blue. Hadn't thought of the copper thing since I have never treated the tank with it, but maybe I'll check it out anyway (Then again maybe I won't--It would be a really funny thing for a person to TRY to grow the stuff, Ha, Ha)