yes your right when I feed them i would have to be very careful . A week ago he freeked out and was hitting the glass of the tank and you could hear him hitting the galss while my senegal is more calm. My tank is heavly planted and there are large pieces of bog wood in itIme with Del's they sometimes spazz out ramming into the walls of the aquarium and rupturing internally. But like others say possibly bloat. Sorry for your loss.