My tortoise is about 6yrs old. Her front legs have been dry looking and discolored for the last few years. I was wondering if it was due to the water she gets soaked in. Maybe its too hard? It only gets put through a brita filter. On the other hand her hind legs look perfectly normal and her scales are a bright red. I use a REPTIRAIN mister and cypress mulch. The humidity in her terrarium is a constant 80-85%. Her front legs don't smell weird. She lost a scale about 6 months ago but thats about it. She doesn't bite at her legs, and she's very alert and active.It looks more like some sort of build up. I started brushing her front legs with a toothbrush when she's soaking. I notice a lot of dead skin comes off but thats about it. Thoughts?