i disagree. my gobies arnt a very active creature. a bonded pair would be fine but i wouldnt put any more than 1 in there otherwise due to conspecific aggresion. they should be fine in a 29, just depends on what species your putting it with. i keep one in a 55, and one in a 30. they couldnt be kept in the 55 together anymore. i havnt read anything on the tank limitations of a goby cichlid but i dont see why it couldnt be kept in a 29.A 29 is way too small for any of the gobies,