My two tail spot blennies have paired off and successfully spawned. From what I can see, the male guards the nest that is in a whole in the life rock deep enough to fit him but with a diameter off less than a centimeter. I can see the eyes of the baby fish inside if I shine a flashlight inside. I don't have a camera that can take a picture of them at this moment but I will soon. The best part is that I was able to film the mating dance. It is amazing to see the female change colors in a matter of seconds from brown to an ashy grey. Here is a link.
Tail Spot Blenny Courting Dance - YouTube
Tail Spot Blenny Courting Dance - YouTube