Found on Lembeh / Sulawesi

i ask for identify for that too

On your first slug, I think it's not a nudi, I can see no gills, perhaps a Sarcoglossa sp. (sap sucking slugs) possibly a Thuridilla sp. which seems to include a lot of colourful species?

maybe, i have no idea. It was about 5-6 cm long. The second one, also of a similar size, was so transparent that I couldn't even see it in the photo. But it requires a very close look.

The first one definitely a sacoglossian, not a nudibranch.

Looks to me like one of the numerous undescribed Elysia sp. seaslug. the rectanglular head with eyes on the side (almost like a small cow) are quite characteristic.

5 -6 cm long ??? I guess you rather meant 5 or 6 mm...

For the second one no other photos?

5-6 cm is correct by both