Hey, I want to change my substrate.. Right now I have "Mardi Gras" gravel that came with the tank, and I do not like the look of it at all. My original plan was to net out about half of what is in there now, and fill the edges and cover the surface with back gravel.. Basically hide the other stuff.. maintaining the bacteria in there, and so I don't have to buy quite as much new gravel. But I plan to keep cichlids in the tank, and if there just goin to dig and spread it out again, i might as well replace all.. another question I had, was switching to sand.... I like the look, I understand that the waste and debris will sit on top.. but theres a few things that I cant seem to find definitive answers to.. 1 - cleaning.. how do you go about it? I would think a vac would just suck it up.. 2 - my tank has a pretty strong current.. will this effect the sand settling and/or cause any problems.. 3 - what kind to get?? 4 - will the bacteria colony still grow and thrive in sand as it does in gravel?? thanks!!