Would a fire eel or tire track eel or any other type FW eel be compatible my 5 inch channa gachua? What if I got an eel around the same size? As long as it doesnt fit in the channa's mouth and vice versa right? Any eels you guys recommend? how about a bichirs? Any fw eels that can do well in a 50 gal, 48 x 12.5 wide x 19 tall?