There is a high chance that this one also has parasites then. You need to get wormer from the vets sooner rather than later and scrub down the tank with reptile disinfectant/dilute bleach. I would also get a probiotic such as Avipro to help stimulate appetite.
A hot spot of 90-95F is absolutely fine.
No offense but don't go back to that shop! They obviously have problems.