in the past week my wal has been getting more and more violent and very aggresive to me even cleaning his tank. checked all water parameters everything is good across the bored. he gets fed every other day two talpia filets. tank is a 270gallon. no tank mates just him. he will charge at the tank if your standing by it also.is this normal for them to act like this outta the blue ive had him for 1.5 years now and hes never acted like this before. any ideas Mfker's?