Hi,
I think some good ideas for you would be in the ram family! How about, Bolivian Rams, German Blue rams, Geophagus family work well in tanks under 55 gallons. Also Blue Acaras would look great in there too!! Try not to put any Dempseys, Terrors, Texas cichlids in there, oscars, as they will all get too big for that size. I hope this helps!
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