Frozen tilapia is cheaper and it assures all worms in fish are dead. All fish contain some amount of parasites no matter how fresh or where you buy it. Bichirs and cats will go nuts.
Is there anything red or purple that he can see from the tank? I know that whenever I wore a red shirt or purple shirt around the tank my silver would freak out. Any other color he didn't care. But as soon as he saw red or purple it was spaz city.