Hey guys I'm new here and I have a question. I was wondering if it would be ok to put a pair of convicts in my tank. I know it needs more hiding places like I was thinking a couple medium or small flower pots, a couple larger rocks or rock piles, and maybe 2 more plants. I think the convicts will be aggressive enough to keep my pet turtle at bay, he seems pretty interested in my cories anyway. The substrate is river rock which is what I'm most unsure about. I don't see why it won't work but most people like sand or gravel I've heard so I'm not sure. I'll post pics a little later today if I can find the camera. Right now stock is 1 molly (only one left from bad tank accident, but thriving now), 3 emerald cory cats, and my painted turtle. My filter is just a Whisper power filter but it's rated for 30-60 gallons so it'll be enough to handle the waste. O yes and the tank size is a 20 Long. Thanks for listening! Please feel free to critisize and give suggestions because I'm new and need em'!