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I dont no why but one of my turtles has a bump inwards on his shell he did not have before and i have notice that they all have small parts of white stuff on there shell am not sure if its cuz ther growing or its the water?

Can you post a pic?

Are you saying his shell is indented in one spot? Is the shell itself soft? What does the white stuff on the shell look like--is it fuzzy and can it be removed from the shell?

If you think it may be the water, how big is the tank, how much water is in it, do you have a filter, an how often do you change the water?

A picture of the shell would definitely be helpful...