Posted: Sat May 27, 2006 11:43 am
Your turtle has been having problems for how long? You said your turtle is lethargic and spends a lot of time basking, both of which are signs of an RI in addition to the lop-sided swimming (which can also be an indicator of pneumonia, which is fatal if not treated). Have you noticed any open-mouth breathing, wheezing, mucus, anything of this nature? The inability to submerge could be due to a number of factors, (but air under the shell isn't one of them). If you pick him up, how does he compare with how your other turtles feel--does he have any "heft" to him, or does he feel hollow (you should feel a difference if there really is one)?
You did indicate he's eating, though---how well/much does he eat? If you feed him in a separate container of water, you could add some liquid vitamins to it (children's vitamins, bird vitamins would do) to increase the nutrients he gets.
Drafts from open windows, AC, etc. can contribute to RIs. It would be good to give him his own tank with a lower water level if the one he's in now is high, and maintain the water temp at 81-82F (get a submersible water heater), with the basking area temp of about 91F.
Your turtles need a bigger set-up---a 10 gallon tank for the two of them is way too small.
A pic of the area of the shell that's separating when the shell is dry would be good...
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-