Spiney eels are all wild-caught imports, and there are many, many species that are seldom imported but turn up as an oddball in a shipment. Best bet is to determine the origin (if possible; if it came along with a load of peacocks, etc.), and figure the same requirements as other species from the same region. Also, hope it doesn't grow into a monster, most of the oddballs do grow much larger than peacock eels.