I have been trying to get some food (bloodworms/pellets) to the bottom for my corys and betta but everytime I drop some in the school of neons swarms in on it and devours it. I've had them for 1 week now and they are getting fat!! I ended up attaching a chunk of frozen bloodworms to a stainless washer with a rubber band to sink it fast but they were still after the worms, they were so crazy they were dodging attacks from my betta and swimming between all the corys to get more. Is there any danger of them becoming sick?