I have two gobys in a 30 gallon tank & they're both about 6 inches long. They're getting territorial & kind of go at it with each other. They can't hurt each other, can they? They get along just fine most of the time. And will they grow out of it?
They're definitely dragon gobys. I don't have a picture worth using, sorry. But they're easily 5 times bigger than my bichirs. They're just WalMart fish, nothing special! They're little piggies tho, so I'd assume that's why they're growing as fast as they are..
[video=youtube;8l9H4FZ9aQA]http://www.youtube.com/watch?v=8l9H4FZ9aQA&feature=player_detailpage&list=PL5E84557C98F0A4CF[/video] these are awesome wish they were mine.