We just got back from vacation, and Squirt is eating normally. However, as he was basking I saw a 'discolored speck' on his shell, I don't know how to describe it; it was a small thing on the lower part of his center scute. I'm very worried because I haven't given him cuttlebone in awhile and i know MBD is really bad..... and at the same time it could be shell fungus, as the basking platform isn't big enough (we got a new one but it doesnt fit in the tank and we can't afford a new one yet)...Or is it bone exposure? I AM SUCH A BAD PARENT!!
Here are some pictures; I apologize for terrible lighting and will try to get some better shots tomorrow. It may appear that Squirt's shell is normal here but I am sure that this whitish gray bump thing isn't normal....um, it looks like a transparent fluid dripped onto the shell and dried if you know what I mean. THe toothbrush thing didn't help...
How would you diagnose the shell, and what can I do to make it normal again?
I appreciate any input you can give me. I am extremely paranoid for the wellbeing of my turt.

