I just purchased a 10 to 12-inch, fat fire eel and I've had a similar-sized tire track for awhile. Currently, I have them in seperate tanks. I've read many a thread on this forum about spiny eels not getting along, after reaching a certain size, especially 2 fires or 2 tires or a fire and a tire. I've also read some threads that state the opposite. There are some people who seem to make it work. What's your experience with the cohabitation of fires and tires? Does it work? I think it possibly could. Thanks in advance.