hi im new to this but i am very concerned about my arowana hes a baby approx.41/2 -5'in long and its a silver.when i got him he didnt have this hump on the top of his back i do freguent water changes hes in a 55 gal tank with a convict and pacu ive been feeding him crickets and am going to start mixing it up a bit with beef heart guppys.but im trippin on his back any suggestions ill try to post a pic