My pacus have lived over 18 years (I am sure that is not the maximum,
just my oldest). We feed them veggies (romaine lettuce, carrots, and
more), Sanyu cichlid pellets, Krill, sometimes feeder goldfish (they
can bring in disease). It sounds like you are feeding him a balanced
diet. The other advice you received is excellent, watch for the
parasites. Does he respond to you (mine are very gregarious)?

Carl
http://www.americanaquariumproducts.com/