Hi. I'm fairly new and was hoping my first post would be about on of my many Betta fish. Fortunately all of my fishies are in tip top condition. However I have a small 1 Gallon tank that i have about 50 pond snails in. On purpose. They are not pests to me. They help with cleaning my tanks and they are also food for my many assassin snails. Recently (2 days or so) they have all been sitting above the water line. all tests coming back saying the water is in excellent condition. Any thoughts?