Weve got 6 blue reef chromis now. Figured that would be a good excuse to help the gobies come out. That was on the list to aquire next.Mine are pretty active. I have two and they spend a good amount of time swimming in the water column. They do like to dart in and out of their burrow as well. They will school as I believe was mentioned by someone else, so if you get several that can be a real nice feature of your tank.