Posted: Fri Jul 20, 2007 1:11 pm
This is a YBS (Yellow-Bellied Slider)? The hole is in the general area where the egg sac would have been, but the picture isn't all that clear. You didn't notice anything there when you got the turtle? I've cared for turtles with some of their egg sacs on them but the sac was pretty much absorbed, not just fell off.
To me, it looks like it could have been the egg sac, especially if the turtle is really small, but it's good to err on the side of caution, I think, and have it looked at. If there's any opening at all, you don't want bacteria to enter and cause an infection, which can kill a hatchling (I'm not trying to worry you, just trying to be cautious here).
Those are a lot of products to be adding to the water (I'm not a fan of adding anything unless it's absolutely necessary). Do you have a filter (didn't really notice one in the pic unless it's that object on the right)? That's a lot of gravel to remove if you clean every 4 days---it would be better to remove it. Gravel traps debris (and therefore bacteria) and at some point your turtles may try to eat it (and there's a chance it could become impacted in them).
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-