What type of freshwater eel preferably carnivorous that would fit in an 80 gallon. Also how do eels do with oscars?
Getting potentially up to 2ft in aquariums, or more I wouldn't recommend that.Monopterus albus or asian swamp eel will fit in that tank fine. It won't hunt down large fish efficiently but it will eat crayfish, dragonfly larvae, and small fish it can catch. I don't know how he will get along with the oscar though.
+1I agree, an oscar alone could fill that tank and then some. It is a shame that oscars are so easily gotten, when most owners have no idea what they are getting. An excercise in practicality... try to sleep in a linen closet. Anywho, spiney eels are aweful fun. I would get rid of the oscar and go for the spiney eel of your choice. Start socking away for an upgrade, this is monster fish keepers after all... only monsters are here haha.