Be advised that the Common Wolf, although AGGRESSIVE and a KILLER is not VERY ACTIVE. During the day they are pretty much motionless, moving only from one place of rest to another. At night they are more active, due to being NOCTURNAL but they are not a fish known for swimming around all the time. To me that is their only DOWNFALL, other than that they possess MONSTER TEETH, JAWS, and an EXTREME BITE. They are very powerful and FAST fish, and many make the mistake of thinking they are SLOW or SLUGGISH, they are LIGHTNING FAST when they want to be. You def. do not want to be bite by one and they can tear fish apart with ease. I really love the whole WOLF FISH family....just wanted to give you a heads up on the COMMON WOLF's basic characteristics. There are always EXCEPTIONS so dont hold me accountable for one who's different. The GOLD WOLVES are not quite as aggressive, get a little smaller, but they are the MOST ACTIVE. But the Common Wolf aside from the Aimara are my fav. Common wolves are affordable, the Aimara is for the RICH MAN...LOL...either way good luck on what you decide...