i really personally would not keep a trigger in a 29 gallon, but anyhow, i just had a goofy thought, training a fish:
here boy
sit up
roll over
sic!
what else could we train them to do
not laughing at you, that is just a little dry humor that came to mind(we all need it once and a while, so PLEASE don't take this one personal, i am really not making fun, just sharing a goofy thought)
fish do learn some things, but i don't think we can train them to do things, like ignore natural foods(maybe help to avoid, by feeding well, but not train)
hey and welcome aboard