well u do seem to have a 'chunk' of moss on the roots... could it be that u're misting too much as in the outside is bone dry but the inside is still actually quite wet? do u fertilize? over fertilize? and if u're paranoid about the mount, y not see if it will 'unmount' b/c if it does, y not stick it into a 1" clay pot with huge chunks of charcoal or bark.
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