Can some one please tell me I'm making mistake or something. It's just that i have being watching to many MH videos of how great it is for acro tanks. and i eventually want to fill my 400gallon 30'' deep tank with acro's. Right now now i have 7 led fixtures over my tank and 4 dual t5 fixtures. growth is so-so with acro's. Also i have not seeing a metal halides tank in over 10 years. and im not to hiped up on how some corals looked under MH.