As some of you know I have a 29 gal reef tank with jerms help this tank has come a long way. Well night before last we put a 250w MH over it just to see how it would fan out, worried about it all day long yesterday went home and OMG the difference I dont really care for the yellow tint however the growth was phenominal I was using PC I know lights are expensive but if you have a coral It would behoove you to invest in MH or HQI Ill see if I can get pics posted sometime soon.