When should I be concerned that my new guy isn't eating? We got him Saturday, PETCO guy said he fed him Friday, and I really haven't seen him eat anything yet. I did a 50% water change today and cleaned up most old food that had sunk to the bottom. I currently have Aqueon pellets, I also tried a flake today, but it's just floating in his tank. Today is the first day he's actually been swimming around and exploring...thoughts?