c_carcharias's Identifications

Searched all over but just one at the good reef wall. Might even be the same individual I saw a month ago! Now even more spectacular fully grown.
I noticed when a fish attacked it or I nudged it, the slug would extend all its cerata out into a spike ball.

~3.5 cm long
~3 m subtidal

Just one. I have it in my aquarium, but there seems to be no change of papillae shape. Lots of tests based on water flow, being squashed under a rock etc. It is not negatively phototaxic so it is hard to test for it crawling under a rock. Even when first found the papillae were spiky.
Overnight it made its way to the underside of the rock but didn't squeeze in and the papillae were still spiky.

Very happy to find this one. Similar to some found under rocks up north. I wonder how much the environment affects their morphology.
Under a large rock on small cobbles. The same rock as the Janolus aff. hyalinus.

~1cm long
Shallow subtidal

First photo is with my gloved index finger for some sense of scale. Curious to know collective thoughts on what the other orange with white spicules might be. Juvenile Coryphellina ? Hydroid gonophores although the orange and white things are quite a bit bigger than the hydroid polyps, something else? These photos are of two individual Coryphellina from two locations several metres apart but both locations have these associated orange/white objects.