is this normal? i went to petco and saw some adf in a tank with either neon tetras or white clown minnows. cant really remember. anyway, there were like 3-5 frogs and a bunch a fish. the weird thing is, there were like 3 or 4 fish on the floor dead with like a GIANT chunk missing on it's stomach like something took a big bite out of it. im guessing it was the frogs because i saw 1 frog next to a stomachless fish and he was actually biting it while trying to swim and stuff. only the stomachs were missing, every other part of the fish wass untouched. i was thinking of getting a small one for my betta tank but that just creeped me out. anyone know why they did this?