Just got a standard 20 gal today. Not going to set it up right away going to ponder my ideas for a while. One idea, is I might do a native tank since I ended up making my 75 gal into a amazon tank. If I do go native route any suggestions for this tank? I know I can easily do sticklebacks or minnows. Would it be too small for a pair of dollar sunfish? Planning on using sponge or hob filter, fennex LED lights, and substrate would be left over floramax and fine sand. Thanks