My ghost shrimp are glass surfing a lot. I have two and have had them for a month. One of them, Filet, does it a LOT like pretty much every single day. The other one, Celia, is pretty chill and acts more like how I would expect ghost shrimp to act aka marching around the tank and grazing. Filet does join her in the grazing sometimes but does glass surf an alarming amount.