29 biocube

[ruvakay]

I have two 29 Oceanic BioCubes with mostly coral and a few fish. Lots of snails too. Someone had mentioned that the bio-balls should be removed. If I do this what should I put in there? There has to be something in there. If anybody knows a better way to set these up, I would be glad to hear it. I have lost several fish but the coral seems to do ok. Is it possible to change the lighting in these things too?
Thanks for your input.