Cardinals are always a crap shoot. If you can keep them alive for the first week after you get them they are quite hardy though. I have an idea for this tank. Try 50 neon's 4 elephant nose and 4 dragon fish. Trust me the neon's will constantly school and the e nose will also school. The dragon fish look like they would take your finger off but will not hurt a fly. Give it a shot, I think you will be impressed.
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