I have two baby red ear sliders. And one of them has something weird going on with his shell, it looks like it's fading a little. The other one has a flesh spot that looks like it was chipped off or something. The only thing I could think of that could possibly do that for the second turtle's shell would probably be the filter, since they love to squeeze in between the filter and the side of the tank and rub their shell against the filter's side. Pics below, please tell me what you think of their shells... the darker one is Luffy, the smaller, lighter green one is Ninja.
oh by the way, the flash on my camera makes things a little whiter than they really are.


Ninja's white spot

Luffy's fading shell

Please tell me if you know what's going on with my turtles' shells. I've taken several measures to give them a better life. 50 gallon tank for 2 baby RES. Basking in daylight about 5 hours a week, more or less. No need for a heater since the climate here is normally warm/hot. A good heat lamp, a little hotter than the water temp. I feed them pellets everyday, and lettuce sometimes. I also do partial water changes every Mondays and Fridays.