I was just recently given a 6" Jag, it seems to have no interest in any of the foods I have given it. I have had him for a little over a week and he waits until the floating foods sink then eats them off the bottom of the tank. The JD and Pike I had previously in the tank would hit the foods as soon as it touched the water. Only thing the Jag seems to eat right away is frozen beefheart. Any Suggestions?