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I had a pair of Sparkling Gourami's in my 5g a few years ago, they did really well in there, and they're a beautiful fish. Just to throw my $0.02 in I currently have 1 Male Betta and 2 Otos in my 5g. If you wanted more than 1 colorful fish though, you could probably get away with 2 female bettas, they get along with each other. As another option
My betta some how got out of my tank and was laying on the floor when I got home the other day, which is why I have this as an empty tank. I loved that Betta to 'cause it kinda knew me. When I walked up it swims to the glass when I opened the lid it didn't dart away anymore either it came up the top where I feed it. I'd like to know still how it ended up on the floor with a fully enclosed glass canopy.
I put two gouramis in the tank, blood red gouramis.