Thanks for the input, This is the first time i've ever had a problem with the water or seen this so I'll start changing it more often. Like I said i change it if stuff gets in it or it gets low, but it at the very least gets changed once a week. I've been using either bottled or distilled water for the snakes since the tap water (even brita filtered water) here isn't even fit for watering plants. I checked for RI and other mucus and didn't see anything abnormal.