I agree that I couldn't keep a full grown Jag in that size tank. 16 inch fish in a tank with 18 inch depth isn't really right. I would like to keep one but dont have enough room or cash right now for a 6 foot tank. I will later but not now. A year would be enough time for me to make future plans for it though. I'm not even sure if I wan't a Jag, I'm just gathering information like I'm supposed to