we've had this guy (presumed) for about 3 years now. I have noticed a section of the carpace toward the bottom of the scutes with a white line - not necessarily at the main joint. I had noticed at least on of these for a long time (>1 year) and don't really think much of it, but I now notice it is on both sides. Does not seam to match descriptions of shell rot so far as I can tell. Have a look at these pics, and let me know what you think (please disregard the cloudy water - I've been off balance for a little while and in trying to clear that up - not a normal condition).
Note the marks at lower portions of lateral scutes:


After drying up the marks are not as dramatic:

BTW - For all who claim fish and turtle cannot live together - I have about 8 goldfish growing to be fine young carp that beg to differ.
