Moray Eel.If you dont feed vinegar eel on a regular basis,don't worry.The culture'll keep indefinitely for a year with little care needed. A couple of times per year, thin out the culture by using a coffee filter and funnel,remove about half the media, and replace with fresh media in the proper ratio. You can then gift a fellow aquarist with the culture to begin a vinegar eel colony of their own. Moray Eel.