I've read they can grow anywhere from 6-10 inches. I have one in my 55 gallon aquarium currently, which doesn't seem like it will be too big of a problem if he stays on the low end of the range... I was just wondering if anyone had any pictures of an adult pictus that isn't a closeup... like... all the pictures I've seen are so close, you can't really get an idea of size. I was wondering if anyone has any pictures, or knows where to find one, of a full grown pictus in a tank so you can see the scale of its size?