Any ideas?

[Scarface8]

Hi guys, was just having a look around the tank with my torch and found this thing, I thought I was seeing things at first, but then it moved, most of its body is inside that hole, it blends in really well, is about 3 inches long but I haven't seen the whole thing yet, it looks like it has little brownish shells on its back and looking real close it's like it has tiny little hairs all over it, here's a Pi and a link to a short video, anyone got any idea what it could be? Dangerous maybe?
https://uploads.tapatalk-cdn.com/20170415/cd7674564b5f8a22628b161e8c1e8e22.jpg
Video:
https://youtu.be/3LAv7UcjMMs

[pagojoe]

No, not dangerous. It's a chiton.

[Scarface8]

Never heard of them before, thanks for that, I thought it may have been some sort of nudibranch but couldn't find any that looked like that

[kyliesreef]

+1 chiton ...... brilliant freebie they're great CUC

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[Scarface8]

Indeed it is, I've read up a little on them, seems they are even sometimes too good, it must have been in my tank for about a year or so, I'd just never seen it and never seen them before, and haven't seen it since haha. My tank never ceases to amaze me with the little things going on in there [emoji15]