They are awesome. I have a YWG / fine-striped pistol pair. They don't have a very wide area, just keep to a few inches around their cave system, so do not cause any problems for me. Give the shrimp some shells, rubble to work with (he does the digging, not the goby). My pair have stayed together after a move to a new tank, and in both, even with tons of rock, they always open up an entrance at the front. I guess they like to look at us too, ha ha. They respond to the light. As soon as they come on, they appear - I see them every day. The shrimp closes up the entrances for the night after lights out.