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 THE TANK AND KEPT TRAPPING IT IN THE CORNER AND REALLY SUCKING AND BITING ONTO HIM , THIS WAS VERY DISTRESSING FOR ME TO WATCH AND IT WENT ON FOR 2 DAYS TILL THE FANTAIL EVENTUALLY DIED YESTERDAY , THEN WHEN I GOT UP THIS MORNING THE APPLE SNAIL WAS LYING ON ITS BACK AND THE PLECO SITTING RIGHT UP TO IT , I TURNED THE SNAIL OVER AND HE STILL HAD SOME LIFE LEFT IN HIM BUT DOESNT LOOK TO GOOD , THEN I SAW THE PLECO REALLY GO FOR ONE OF THE SILVER TETRAS , IM VERY CONCERNED AS TO WHY ITS STARTED ACTING LIKE THIS , CAN ANYONE HELP OR SUGGEST WHAT I SHOULD DO ??? THE PLECO IS VERY LARGE APPROX 8" LONG AND IVE HAD HIM FORM BEING TINY .