Nudibranch - Clown Doris

At first it looks like paint thrown at a rock. When I hold my breath and the current stops for a moment, I get a proper look at the
nudi- two long fluffy antenna and a tassel at its end flutter in a slightly different rhythm to the waves. I giggle to myself about the
nudibranch sliding so slowly and obviously over such a fast moving, improvising ecosystem. I surface to catch my breath, then look
again after just a moment too long. It’s gone…