I think they'd fight. I had to move my watchman goby because my starry blenny got territorial. Goby is now the only resident in my newly setup 10g frag tank. Still tinkering with it. Debating if I want to get some nano skimmer, an aqua clear 50 or 70, and an inkbird (just has a heater without a control right now).I have an Orange Spot Blenny. I don’t know if such a similar one would work in my tank, even with all the nooks and crannies. Tank is 36long/24wide/16.5 high