Posted: Fri Sep 04, 2009 12:45 pm
Do you mean the turtle is getting a white line down the spine, which is a little raised? If so, perhaps the shell was rubbed against something; hatchlings sometimes are a bit lighter in that area as well. A pic of the shell dry would be good to show exactly what you're talking about.
I hope by "pebbles" you mean pellets...
What kind of light are you using? Does it give off heat? If so, your turtle also needs to be basking under a UVB light (which is flourescent and doesn't give off heat) as well. Two lights---UVB light and a heat source, both of which should be positioned over the basking area. If the light you're using is a UVB light, add another light to provide heat. You can use the one you've got if it gives off heat or use an incandescent light bulb. If the light you have gives off heat, get a UVB light. Basking area temp should be 88 - 90F.
Improper lighting will contribute to shell problems.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-