The following do great in coldwater/subtropical set-ups:
White cloud minnows, zebra danios, rosy red minnows, rosy barbs, hillstream loaches, freshwater blennies, weather loaches, golden barbs, green barbs, mosquitofish, paradise gouramis, platies, and sunfish.
All would work in that size tank although not all together, ha. The paradise gourami in particular is rather territorial...but also pretty
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White cloud minnows, zebra danios, rosy red minnows, rosy barbs, hillstream loaches, freshwater blennies, weather loaches, golden barbs, green barbs, mosquitofish, paradise gouramis, platies, and sunfish.
All would work in that size tank although not all together, ha. The paradise gourami in particular is rather territorial...but also pretty