I believe that by "Sun" catfish, you mean what I call an "Eclipse" catfish (Horabagrus brachysoma). If so, I have a couple that are about 4 years old, and seemed to stop growing at about 8 inches. I think you'd be ok with 1 in your 75g with your JD, as long as that completed your stocking list. You'll need a couple places for your catfish to hide as they're light-shy except at feeding time.
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150g long S Amer cichlid; 90g C Amer cichlid; 90g Malawi cichlid; 40g Tanganyika cichlid; 29g "Shellie" cichlid; 29g Pea Puffer. 6,500g koi/native catfish pond; several smaller ponds
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