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Hi MrsJones, Welcome to Tropical Fish Keeping.
There are many different kinds of fish that can go into a 20 long but before we suggest any can you provide your GH and PH? I would also atleast add some sort of substrate. It will make your fish more comfortable in tank. Also watch the temp in the tank a very sunny spot can heat up the tank not always but it could. I would also suggest some kind of decoration in the tank to give the fish some place to hide and help provide some cover/territories.
There are many different kinds of fish that can go into a 20 long but before we suggest any can you provide your GH and PH? I would also atleast add some sort of substrate. It will make your fish more comfortable in tank. Also watch the temp in the tank a very sunny spot can heat up the tank not always but it could. I would also suggest some kind of decoration in the tank to give the fish some place to hide and help provide some cover/territories.
