They shed their skin, similar to a lionfish but more often. Mine would leave a clump on my rocks and I would just syphon it out. I searched to find more on this for you but it is hard to find anything, I did however find this at wetweb:
"Taenianotus triacanthus Lacepede 1802, the Leaf Scorpionfish. Indo-pan-Pacific. To four inches overall length. Usually found amongst reef rocks on a open setting, rocking like a falling leaf. Molts twice a month. Feeds on small fishes, fry and crustaceans. Comes in browns, blacks, yellows, reds."
Kaye