i am so sorry to hear that but iv herd that some males do that especially if they are first time breeders. recondition them and try again.this time if you werent already doing so continue to feed him pellets, leave a light on at all times, and try to avoid watching him constantly. otherwise if he starts munching pull him asap and try putting small doses of anti fungal meds and posibly even a bit if salt in the tank with the fry it will raise the odds of fry hatching by quite a bit more than just plain water. another possibility is that ther was something wrong with the eggs and you didnt notice(infertile or fungused) you could also try a pair that have been bred atleast once before with a sucessful spawn.