If it is, I would go ahead and return it. Two Bolivians can co-exist in a 20, if they are a pair. However, two males will fight constantly. I have two males in my 55 for the longest time, and they still would fight over territory.
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Four Tanks
55 Gallon - Planted Display Tank
50 Gallon Nursery
20 Gallon - High-Light Planted Breeder
20 L Gallon - Newt Paludarium
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