I had recently bought 3 African Butterfly Fish from Petco. That has been 3 days ago now and none of them seem to have any interest in eating. I have tried frozen bloodworms, frozen beefheart, flakes, moths, ants, and live wax worms. They seem to notice it being there but not eat any of it. At one point I was dangling a wax worm around the tank and one swam up and opened its mouth making it seem as if he wanted to take a bite but no bite. I have heard that they like crickets a lot and will probably go out and try to buy some. Should I be concerned at all or is this not really a big deal?