Okay. So I've got several marimo (cladophora/aegagropila) in my fish tank. And the thing about marimo is that sometimes it gets oxygen trapped inside and floats to the top of the tank.
It's quite lovely.
However, the thing about snails is that they stick to things. Apparently even if those things decide to head to the top of the tank. So here you have the clear photo to accompany the somewhat blurry video of Mr. Snail's Wild Ride.