Ok I have had eels before, but just peacock, but it's the same basic rule of thumb. They should be in sand substrate, since freshwater eels like to burrow and the small bebbles in my opinion are still to hard for there soft faces. They like sand NPTs. Most fresh water eels get to 8"-12" so they should be in minimum 30g. They are carnivorous so small fish can become potential snacks. I fed my eels frozen blood worms, but others also feed them earthworms and black worms. Also eels are nocturnal.
I live at a zoo lol