Edit* Yes you can keep 1 Oscar, and One jack dempsey for life in a 75.my number one fear is that once i get a tiger oscar whne it gets older lets say 4 5 years age it will sit on bottom of tank and only come up to eat! but anyways you guys seem to be avoiding my question. 1-3 tiger oscar with 1-3 JD in a 75 gallon?
This.Edit* Yes you can keep 1 Oscar, and One jack dempsey for life in a 75.
OR
You could get 4x Gulper Catfish!!
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I wouldn't say 4 gulpers, but you can keep 1 or 2. I personally don't like gulpers but if that's what you like go ahead. I myself prefer bichirs but they probably aren't aggressive enough for your liking. Exodons are awesome but they don't get big. I think you would like something along the lines of a wolf fish or puffer.