The Golden Dojos (from what I hear) don't get as big--maybe 4 inches at maturity. I have two in a 55 gallon and am thinking of getting another. They are out during the day as well as night, and it's so true--what characters they are! They are always playing and slinking about, happy little critters. I'm so glad I got them. In my opinion they are a lot more sociable and viewable than the kuhlis. I have many hiding places, so I think that makes them more prone to coming out and showing themselves! The yellow color too, is beautiful.