Nudibranch - Glossodoris rufomarginata

This Glossodoris rufomarginata Nudibranch is mostly orange/brown in colour with inner white margins.
They are around 3.5 cm in size and there are 2 of them in the picture. During the dive, I didn't noticed there was another Nudibranch in the frame until I check my pictures on my laptop. The 3rd Nudibranch is of another species, it is the tieny 'black/white' thing on the bottom of the picture towards centre left. Despite the small size of this Glossodoris rufomarginata Nudibranch, can you imagine how small that tiny one was?