I've seen some other boards regarding stocking but I thought I would make my own. My new 20 gal tank is supporting my 3 guppies but obviously I'd like to eventually stock a community. What can be stocked with my 3 male guppies besides small tetras? Not a fan of catfish or the kuhil's. I'd prefer fish with color. I'm running a penguin 150 bio wheel filter and its stocked moderately with live plants. It's also gravel substrate and I do have some decorations for hiding. Thanks for the help.