im betting on the under tank hearter burn..it looks like a severe one then...the temps are 87 atm with the uth unplugged about 2 min ago...but thats the temps over substrate....when gets in his hide he tends to move the bark and it shows the bare glass...which is probably is whatburnt him...what i dont understand is why did it take like 3 months to appear in 1 week? i just dont under stand why...i have left a live mouse in the cage b4 but i stopped doing that and when i stopped he was fine...