So I recently got a 20 gallon all in one cube tank that I plan to make planted. My substrate is fluval stratum and I am going to have foreground, mid ground and background plants (hopefully a lot). I want to have a Betta fish in there definitely but now I don't really know what else to do. I want some algae eaters because I have a high amount of light, CO2, and fertilizer, maybe snails? A small schooling fish would also be very nice but I don't want to overstock and I want all of the fish to feel comfortable. Any ideas?