Hi there I have a 20 gallon tank with a centerpiece rock work that goes vertical in the tank. I have 1 small sweet clown and a YWG and pistol shrimp pair, they have claimed underneath the rockwork and I believe take up the entirety of area in the sand. So can I still add a Neon bar goby I think they are the cutest but not sure if he will try to sleep in the same area and they might fight, or if they even sleep in the rockwork at all. If anyone has tried this combo or knows if it could work please let me know, thanks!