Eclipse cats are large fast growing predators that easily reach around a foot in captivity and can grow as large as 18 inches, fish of half the catfishes size or smaller will most likely be eaten during the night. They are mainly nocturnal spending much of the daylight hours hiding but are extreemly active at night so need a large tank with pleanty of swimming room, i wouldnt recomed anything less than a 5x2x2 (150g) aquarium.