Last week one of my Mystery Snails laid an egg clutch (May29/30). For several days after she was above the water line when it was lights out, but no more eggs. For the last 3 days she has had extended periods of being dormant. She is tightly closed at the bottom of the tank. I keep doing the "sniff test" and she is alive. She is closed up like this in different parts of the tank so obviously she is moving around. Is this normal? I tested the water and I am zero across the board, and the other 2 snails that she shares the 6 gallon tank with are fine. The temperature is 73 degrees.