I get up this morning. First thing I do is feed the fish. I open the door above the tank to find one of my mystery snails sitting on top of the glass totally out of the water. I don't know how long it had been out. I put it back in and was floating for a couple of minutes, I guess to take in water before it sank.
As I am writing this, I still cannot find my second snail, but have discovered a second batch of eggs on the 'u' tube of the inlet pipe of my filter which is 6 inches above the water line!

I don't think this batch will survive - it's too dry, but cannot find my snail. Could be in the cupboard where I keep all the food, filters etc, anywhere.
How long can these critters live out of water? It may have lost its way back into the tank.
Just found the second tucked under a rock!