I'm a new turtle owner and I own 3 red eared sliders who are now 3 months old.
I noticed they have developed brown spots on their bellies and I'm not really sure what it is. They have regular exposure to sunlight (but not a basking UV lamp) and are fed pellets 3 times a day. There is no change in their behavior or eating patterns.
Any help as to what this could be would be really appreciated as I have no exposure to a Herp Vet.
Is this because they do not have exposure to UV Rays? I bought a lamp today so...Should I be worried?
Here are pictures of their bellies:



Thanks.













