I think earthworms are 99% protein (not really, but extremely high), or something crazy like that. They are extremely healthy for the fish.
I do have a hard time believing that a few dead ones would have caused an ammonia spike and tank crash though. If you think about it, they would have been converted mostly into ammonia by means of fish waste if they had been eaten, probably even quicker than they would be just decaying uneaten. I'm not saying you should leave them in there though. I think there was something else wrong with that tank...
I do have a hard time believing that a few dead ones would have caused an ammonia spike and tank crash though. If you think about it, they would have been converted mostly into ammonia by means of fish waste if they had been eaten, probably even quicker than they would be just decaying uneaten. I'm not saying you should leave them in there though. I think there was something else wrong with that tank...