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Labroides dimidiatus
Around 4 cm long. Erratic swimming
Zanzibar
Thank you for the ID suggestions! After doing some additional research, I believe it is a Juvenile Bluesreak Cleaner (even though both Bluestrak and neon blue goby look similar). The main hint is the "erratic" swimming of the fish that I've noticed. Here is the video found in youtube https://www.youtube.com/watch?v=J8H2f...
Thank you once again, for your contribution!
Shape looks like a cleaner wrasse. I would suggest a juvenile Blue-Streak Cleaner Wrasse.