30 gallons

HoldenOn

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30 gallons is kinda small, to small for knife fish, same with eastern sunfish. I don't know. Someone on here will be able to give you a better answer.
 

HoldenOn

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The Spotted Climbing Perch is pushing it, but may work. I'd get a second opinion. Keep in mind none of these fish can have any tank mates at 30 gallons.
Edit: You would have to upgrade eventually.
 
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