Hello all. I just added two nerite snails to my 55 gallon aquarium yesterday. I've never had them before, only mystery snails, so I'm not familiar with their behavior. Water conditions are 0 ammonia and nitrites, about 5 nitrates. One of them has been sitting outside the water, just above the water line almost all day. Ive hard they like to try and escape, but he just sits right at the lip. Since my water conditions are normal, and the other snail isn't doing it, is this just nerites behavior?