rmcder said:It's not quite as bad as that, he said it backwards - He meant 30" of fish, 60 gallons. Still, than means your hypothetical 10" oscar in a 20g tank which isn't a whole lot better!
55g with five firemouth obviously depends on a lot of unknowns. Will he get a pair? Two pair? Is one or more of the firemouth psychotic? If they're relatively peaceful, he'd be fine. If they pair up, two pair would about do it, and the singleton would be in trouble. One pair with three singletons might work ok. That's the reason I purposely avoid pairs; a little less unknowns.
Sorry read the rule as he posted it, twice,
2" of fish per gallon. 10" fish...divide by two..5 gallon.
If you want to take his written version...
6" at 2" per gallon..is 60 gallons, is even worse...
Five 6" fish...30"...2" per gallon... a 15 gallon would be okay. No it is not okay since they will be in a 55 vice a 15. A single pair maybe...but not responsible..IMO.
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