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Help !! What is this ?

Looks like cyanobacteria.
Keep siphoning it out. Blast your rocks with a turkey baster regularly. I would also siphon the sandbed during water changes to get rid of rotting food, detritus, etc. Maybe play with your flow a bit to try and keep the detritus suspended to eventually reach your skimmer/sump.

You could try "lights out" for a few days after a thorough cleaning.
 
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