I got home from work and after a shower to wash away my day I usually check the tank and I found my tiger snail riding around on my floating thermometer. The weight was just enough to keep him a couple of inches from the surface then he got caught on a plant.
There was a period where I did not clean the lily pipe outflow from my filter for a very long time and it was completely covered with algae on the inside. One day two of my nerites somehow found themselves in there at the same time and cleaned the entire thing up in a few hours, by the end it looked brand new =D.
That's great! They must be smarter than we think! I watched the Ramshorn snails "playing" in my QT for near 45 minutes the other day. It will be hard to believe, but I witnessed them taking turns "riding the waves"! They were in a group near the HOB waterfall and one at a time, would move into the flow and ride a complete circle twice around the tank than get back in the group and the next snail would cruise. Crazy hu?