i overfeed all the time. some fish will die, but you don't want those anyway. you want to darwinize and select the ones that can handle the environment YOU want to throw at them, you don't want to have to lower performance to suit the weakest, least tolerant fish. key is to make sure all the fine particles of uneaten food (crumbs, if you will) get cleaned up. so further downstream, i have suckerfish, crabs, crawfish, and feeder minnows that i don't feed scavenging those fine crumbs, which will foul just about everything, cause algae growth, root fouling, pump impeller fouling, and so on.
my current ap grow:
https://www.rollitup.org/hydroponics-aeroponics/559989-flowering-aquaponics-revisited.html