They like to hang out in the branches of acropora ideally(have heard if underfed they may bip at some sps but sounds very rare). Having said that pretty much any coral i think is fine for them. I
I had a baby yellow watchman goby in my biocube 32 and he kept squeezing through the little holes and getting in the back compartment. It was very frustrating. He did that almost every single day until I killed him on accident trying to get him out. I plan on getting a bigger watchman goby so he can’t squeeze through. Just wanted to give you a heads up that could potentially happen with a fish that small