I have a spider who is like a dog when it comes to her water. Everytime I change her water out, no matter if it was clean or dirty, she slithers over, drinks a little, then continues to blow air into her water making bubbles. The first time she did this I thought something was wrong (I had never seen this before!) But the vet checked her out on her last visit and when I told him he said she was fine. Still to this day my snake decides to blow bubbles in her fresh water. lol