Today my pond snail just wants to escape and keeps coming up out of the water (the water is not to the top as i have surface breathers) Why is it doing this and what can i do?? i checked the water and it's ok - Ammonia and nitrite 0, i did a big pwc this morning. What else could be wrong? i have a baby pond snail who is not having this problem and the rest of the tank mates seem just fine. Any ideas?