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Reminds me of this.
https://www.reefcleaners.org/store/out-of-season/oxynoe-slug-detail
I remember finding one of these on some wild codium I collected. I believe it sapped up the juices from the codium for a while (the algae grew strange "bug bite" like bumps during this period). Then, it started wandering around my aquarium and eventually disappeared (probably did a "Nemo" into my hob filter but failed to escape).

Thanks. It appears that's what the second ones are. The first pictures I took though are of a different slug. Distinctly different. There is not bulge and it has white frills down its back, which is why I was thinking baby lettuce nudi.Caulerpa Slug. Harmless, feeds on macro algae

