Best "center piece fish" for 20 gallon long?
I have a low tech 20 long. I already have 4 cories and 5 nerite snails (and a king betta- he might get moved elsewhere). I want a peaceful tank. What is a good center piece? I was thinking some kind of gourami? Are the dwarfs, honeys, opaline aggressive? I like red platys too and want to maybe add 3 or 4 of those.
1 gourami (which kind?)
Any other good, peaceful fish you can think of? I also head that gourami are known to carry disease?