I would be surprised if this was caused by chlorinated water. I have used tap water in my turtle tanks for as long as I can rmemeber. I have never had a turtle develop this color on its mouth. I was thinking it may be some form of algae or some type of fungal or bacterial infection but, it is very hard to tell anything from that photo. I did notice the turtle's head looks otherwise very yelowish in the pic with the bluish lips, some of the tank looks more bluish than in the other photos too. The photo is also quite blurry. Maybe a better more true to life photo would make it easier to tell what it is.

As to the suggestion that you get a larger tank, I would definitely go along with that recommendation. One that would be about 2 times the surface area would be a good idea for now, but one that would be about 3 to 4 times the surface area would be a better choice. It does not have to be quite as deep. The snapping turtle would also benefit from some hiding places - objects that it could easily get underneath. This would give it more of a feeling of a turtle's equivalent of security than what it probaly has now.

best regards,
Glenn B

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