I have a port hoplo catfish named rocky in my community tank, he has always been pretty placid and gets on well with all the other fish. last week when trying to net another fish rocky darted at the net and struck it hard, then as i had the net at the surface he struck with enough force to hot the net out and cause a splash. now any time i get anywater for feed he attacks the cup.

i think hes hurt the front of his head doing this. What would suddenly cause this>>>?? im actually nervous about putting my hands into the tank now...

please help!!!!!