You need to understand that you can ask and ask all around in the forums this question, but do know this. the SFE isn't the most docile of the moray species, and can be aggressive from some marine experts. Still your a living creature with one understanding for its own survival. That while in its juvenile stages, it will hang in groups of other young eels. But once its grows, it has its very own survival in thought.
You need to see this from the way the eels normal nature and ability which comes into play here. Eels has only two main foes, one be the grouper family and the other be themselves. Many eels will eat other eels, so you could continue to ask around, but from some who only background in this is they feed their eel every two days, they may never learn of their eels true ways of survival be. but eels in the same tank, will battle over the food they get, even if their a known mated pair, it is in their nature.
Buddy
