That is so fun! I love the videos, you need to make more and share them! I love your tank and always love reading about it and seeing your pictures.
I'm impressed that your pistol shrimp comes out to play. There is one somewhere in my tank that I've yet to see and I've had the rocks he came with for almost 2 months now. I *think* he's taken up with the diamond goby, based on where it sounds like the popping is coming from, but I can't be sure. And if that's the case, the shrimp has the goby whipped because the goby does all the work.
Now I definitely want a pair like yours for my new tank!