CAN ANYONE GIVE ME SOME ADVICE ON MY PLECO , HES BEEN IN MY TROPICAL TANK FOR A LONG TIME WITH A TELESCOPIC FANTAIL , AN APPLE SNAIL , 6 TETRAS , AN ANGLE FISH AND A KISSING GUAMI , HES ALWAYS BEEN VERY PLACID AND QUIET BUT 3 DAYS AGO HE WAS BEING VERY AGGRESSIVE AND CHASING THE FANTAIL ALL OVER...