i got my arowana when it was 3 inch long . it has gottan beat up by another older arowana now his tail is messed up real bad, now he is about 5 inch long and his tail still havent recovered it has shredered. i also have little white worms in my tank thir are like miro size , how did they get there how do i get rid of them , they keep on growing back, are these eating my arowana tail?