Due to the jack dempesy's aggressive behavior even at a young age there is limited tank mates in a 65 gallon. I personally have a small jack dempesy that goes after my 7" clown knife so I would go with a bottom dweller. I also have a striped Raphael catfish and the don't bother each other. If i were you I wouldn't go with anything bigger tank 8" so that the jack dempesy doesn't feel threatened. You could go with
1: striped raphael catfish
2: spotted Raphael catfish
3: eclipse catfish
4: any species for Cory catfish
5: crayfish
6: African featherfin catfish
6: bristle nose pleco
7: rubber lip pleco
8:
striped peacock eel ( get about 18" but if provided with decoration they will stay out of each others way)
Hope this helps.
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