11-15-2012, 12:37 PM #6
Welcome to AC. Nice to see you here.
Perhaps this store will order you some other types. Have you asked them? A 20 gallon is not large enough for clown loaches that belong in schools and grow very large. Perhaps they will take back those loaches and exchange them for other platys or fish supplies.
Platys reproduction rate does not allow too many of them in a 20 gallon.