Hiya Kau, 96 watts and right at the top of the water. About 6 inches under tops. The store I bought it from had it at least half way down so i'm not getting it here. Unless the r/o water means that much to a clam and not the othe inverts. Like I said before, I have a stoney coral in there and it's doing just fine. Wish I could remember what it's called. Looks like a large silver dollar. Flat like that. Mouth in the middle...I have glaxia, mushrooms, etc. and they are al doing good...Thanks for replying...