Yea id say its a burn as well. I have dealt with scale rot unfortunately and it doesnt look like that. U need that thermostat and take everything out so u can see the pad under the glass. Let the pad run for a while and let the thermostat kick on and off. Then use a infrared gun check the temp through thenglass. Do not let it exceed over 90 cause if it burrows under ur substrate and lays on glass. U can burn her like u have. Make sure when u readjust it u recheck it on plain glass. If for any reason u cant keep heat up. Find a second source of heat such as a 75w infrared bulb on a dimmer switch. U can buy the dimmer at lowes or home depot for $12. Well worth the money
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