certain animals have certain diets. if you dont feed them what they are SUPPOSED TO eat. they will certainly be unhealthy, unhappy,and yes they can starve to death or die from the bloat or constipaton.no matter how much of the wrong food you put in. how many fish does it take to learn this. one in my case. maybe their are exceptions, but my spotted peacock eel would not eat, and it wouldnt eat bloodworms either, i dunno why. but i wont keep buying fish i know have a diet that im not willing or able to provide. sorry, not trying to be mean or anything.it happens to all of us. good luck, thanks for caring about your fish!