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A few eggs and one small slug within very dense obelia bushes on some floating macrocystis heading to shore. I grabbed the blades and have them in my aquarium. Hopefully they might hatch and grow.

~2mm long

Edit (27/4/23): added some better pics (first 3). Image 2 & 3 shows it eating a zooid. And you can see in image 2 a zooid which has been eaten. Also I counted at least 2 slugs now.

Edit 2 (28/4/23): The tank is constantly filled with tiny medusa from the Hydroids! probably ~5 per cm^2. I never realised they constantly released medusa like this. The filter is always sucking them up but they keep coming!

Edit 3 (29/4/23): The nudi is bigger, now ~3mm long. I realised all the medusa in the water are actually from the hydroid polyps themselves. Most of the hydroids are now empty which might not be good for the slug. I didn't know they could do that, it seems they do it when there is low water flow. The higher flow areas still have some polyps. (edit: Unless most did just die and they are just pumping out medusa). I really thought this would be an easy nudibranch to keep with such plentiful food but it seems that's not the case.

Edit 4 (1/5/23): I count 3 now. The biggest one is 5mm. I got some algae with Orthopyxis hydroids but I don't think they like it sadly.

Edit 5 (3/5/23): I set them free as the seaweed was going bad and I couldn't find any more hydroids. I counted 4 in the end.