Sorry about the panic attack.
Thought it looked similar to the Chequered box snail (Heliacus spp) which munches on zoanthids
Thanks, I spotted this guy by accident and just hoped for an answer saying he's harmless. To find him again in that LR jungle would be next to impossible.
On the pic he might look big, he's about 5mm from tip to toe.
Thanks again
localOk what LR normally has the best living creatures