Well, when you only have a 29G tank, and want to have a lot of fish, your pretty much limited to gobies as the majority right? I do like the huge variety gobies give you though.
Do they ever fight with eachother? I know if any of my other fish go near my watchman's cave he will swim out and open up his mouth at them. I figured if there was another goby they would fight over caves all the time.