Scale rot is NOT caused by wet substrate. Scale rot is an infection caused by bacteria grown from days or weeks of dirty, wet or humid floor conditions. The 'dirty' is the feces, urine or combination from the snake and/or live feeder that were not cleaned up like one would. Humid and wet conditions allow the bacteria to grow, the snake moves around in it, etc. What you need to worry about is fungi. Those effers thrive in wet and humid conditions with little air flow. That is a nightmare to rid off from an animal should they get it inside their body, sometimes requiring aggressive treatment and no cure. So generally, you would want a damp (not wet) substrate for humidity, generous air flow and spot clean as needed and tank clean once a week or every other week depending on how much your snake poops/pees a week.
In your case, once your snake gets the all clear from the infection, you should be safe to use damp substrate like coco fiber mixed with moss. Damp means when you squeeze it, it should not be dripping water but it is wet on your hand. Glass tanks allow air flow because of the mesh lid which also does not retain humidity. Block half off with plexi glass or whatnot, leave the other half open for air flow. It is best not to use lights or CHE which dries up the tank but you can work around that by adding a big water bowl, a humid hide or a humidifier.
Most importantly, remember your snake must feel comfortable enough in their enclosure to eat. Add more than 2 hide in there, lots of foliage and clutter it up so it can feel secure.