Joe DOUBLET le 25/08/21
I believe that this is a Sphinx blenny (Aidablennius sphinx) however, it was relatively very small (~ 4cm) and extremely wary. In fact it just dashed into this small hole in the rock and didn't move out even if I move away. What was of interest was the strong coloration. I thought it could be a male protecting its nest but then the size was rather too small to be an adult.
Joe DOUBLET le 25/08/21
Thanks Daniel
Daniel ROY le 25/08/21
Hello
Yes I think it's the sphinx blenny.
https://doris.ffessm.fr/Especes/Aidablennius-sphyn...