We are talking about a 30 gallon fish tank dude. unless you have the recources to accommodate it ie larger tank why put the fish in a tank that isnt suitable?
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Which is is a perfectly acceptable size tank for a trio of 4-6" catfish. I know plenty of breeders who'll breed large schools of Cyprinids and Corys in 5.5 or 10 gallon tanks and the fish are all fully grown and extremely healthy.