Just to let everyone know, his 20 gallon is really a 29 gallon. He gave me the dimensions in a differnet post, and it is a standard 29. He said his tank was 30" long x 12" widex 18" tall.
In your 15 gallon, a pair of dwarf gouramis would go great, and you can put cardinal tetras with them, as they like the same conditions. I don't know too much about goldfish, so I can't help you there.
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