On my 2in RES's shell, towards his tail all along the back, there is a lighter area that gets darker and it's brown. Also, there was little white dots all over his shell that I got off with a toothbrush, and in the middle of his shell on the spikes, it's white. Everything just showed up today, and I'm a first-time turtle owner so I don't know what all this means. Is he just growing? Anyone who can help I'd really appreciate it.
He has a 10 1/2in L x 6in W x 8in H cage. The cage has a light above it, and no filtration. I'm working on saving money to get him a bigger cage, along with filtration.