Remove the sand, or the clams and shells etc? I'm planning to remove everything except the lotus roots if I get the fish. (from the bottom I mean, the floating island stays.) I was originally planning to get some eels, as in a freshwater morray and a few peacock eels, but stingrays are simply too cool to resist.If you clear out that bottom i think you'd be ok for a while.
Are there any "dwarf" species?