Within the next year or so I am beginning to set up my full fledged monster fish room, the main tank will be a 350g that's all planned out and going to have a Fire Eel (I am obsessed with FW Eels). And the other tanks are going to be: 2x 125g; 4x 120g; several 10-20g shrimp and black worm tanks for breeding food. I want to have as many various types of FW Eels as I can in this set up. I already have 3 of the eventual 7 tanks fully planned (the 350, 1 of the 125s and 1 of the 120s). I want to know if I can reasonably keep a Tire Track with maybe only 1 or 2 tank mates in an overfiltered 125 or 120g. Extra maintenance is not an issue, it's more a concern that the fish will be comfy. All scapes are being designed specifically around the Eels.