I've been eyeing a flagtail at my lfs. With the research I've done, it seems Flags are bad about sucking the slime off of rays and cats. Nothing was mentioned about eels, but I'm guessing it would be the same thing. Anyone here have that combination or know if it would be a problem? Eel is a fire eel about 10" in a 120 with plenty of cover. Flag is about 4". Thanks.