Nope they can get to around 12-13" long tho! Engineer/convict goby are big time snad movers aut really don't seem to need a lot of swiming room. But I guess that since they are big fish they have a large bioload too. I have one in my over crowded 29.
Yes, that's exactly what my baby is. Beautiful fish, yes? I know he will continue to grow (outgrow) the nano, but not before this contest ends and then I will move him into my 90g. Maybe I will add another when I do.