lol. Late evening here and I'm just seeing this post. Oddly enough, I shot a short video just today of my Goby without knowing this post was here. He has, by far, been a total blast to have in the tank. First he has his own cave space under the center rock structure in my tank. He moves so much gravel around it. Constantly taking gravel down in the hole and then later on, bring it back out. And he is somewhat protective of it too.
So mid-day, I put some flake food into the tank for a feeding. This always brings some snails up out of the gravel. One happened to come up and sit in the "threshold" of his cave. He wasn't haven't it! I've seen him do this many times. First time I tried catching a video!