I was talking about both. I haven't seen alot of them, but I haven't seen one get that big, not saying that they couldn't. I have seen quite a few dragon gobies and they do get that big, 6" at least and the ones I've seen have been pretty aggressive, at least territorially. My blue spot is pretty mild mannered, I've had it for about 5 months, haven't seen significant growth, I'm not sure it has. It may be 4" long, but it's a small 4 if you know what I mean.