Like what? Raise the N and P and potentially promote algae? He’s trying to raise N and P. Potentially promoting algae is the worry regardless of how N, P, and organics are raised.I probably would normally agree, but when you have only have two fish in a 50 gallon tank, I think feeding more to compensate for lack of fish poo will lead to other unwanted problems in this situation.
There isn’t anything special about fish poo that makes it better than fish food eaten by something other than fish, for raising nutrients. Obviously I’m not saying he should recklessly dump in a ton of food. Just that you don’t have to add more fish to feed more if feeding more is the goal.