Suggestions for fish for a 2ft tank

[Carowoot]

Currently have two black sailfin mollies in there. I'm going to put one or two dwarf gouramis in there too because I have 3 in my other tank and there is a bit of fighting that I want to break up.
Suggestions on what else I could/should include? (I have neon teras, albino cories, 2 mollies, a peppermint bristlenose and of course the gouramis in my other tank.)

 

[Carowoot]

Oh and it's 15 gallons

 

[Fishbay]

Dwarf gouramis would be good

 

[SKB]

or guppies or endlers livebearers

 

[Carowoot]

or guppies or endlers livebearers

Guppies would be good!