So I'm trying to find out which is better gravel or sand? I'm new to this fish thing and I'm learning as I go I have gravel right now but I'm finding that EVERYTHING (food and poop) sinks. When I do the water changes it seems to stir everything up and makes the tank look dirty. So would sand be better. And I don't have any algae eaters well I just got 2 little snails but should I get some thing like the catfish that eat off the bottom.