:Well just swiched out my old sort of natural color gravel for some brand new black gravel. I painted the back of the tank black as well to give it more of that erie feeling you know the one where the women get scared and cling on to ya, yeah that onebut anywho, I just put the 10" red, 8" caribe, 8" red, and two 7" reds in the tank, after getting splashed in the face and them throwing water all over everything, they have now came out and are swimming and I tell you what WOW, they are so freaking dark and have been this way for the padt hr and I mean dark. I have one 7" he is so datk right now his purple is alot more noticable and it was prety noticable before ( possibly from peru). But all of them are so dark they almost blend in with the back round, ia lso have the light candy cane striped to allor less light to penetrate the water. I have a piranha cam and you are all wlecome to see it if u IM me on yahoo at bcollins111900 and i wil llet ya see, if i am not online Im me and I will get back with ya.