Yep, sounds about right.
Although from your previous posts you have said that you house them together. Food refusal is very common with BP's housed together. Although you might not be having problems now, it would probably be more beneficial for them to be housed separately, especially if you are going to get a fecal done for each of them. That way you can tell who's poo is who's (haha).
A fecal float checks for parasites that could be leaching the nutrition from your BP causing them to either loose weight, or gain it very slowly. I am pretty sure only a vet can do it. I don't think a petstore would even know what one was.