hey everyone, i have a new 20 gallon tank set up upstairs thats been running for a bit now and im ready to get some fish! I don't want a whole lot just a few to get started with. What would be some good ones to start with? I have 1 corydora right now but im picking up 3 more for him today. just want a couple middle tank swimmers and such. not a fan of mollies or barbs. any suggestions?