I have kept large severum, JD, jags, oscar, green terror, pike cichlid, and even a large mayan with 15" pbass before. All of the other fish were at /minimum/ 8", with the pike being closer to 12". The tank is a 300 gallon and very lightly srocked, no more than 10 fish total in there at any one time (right now it's 2 each jags, pbass, severums, with a catfish and bichir as ground cleanup crew).
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