Loads Of Micro Bubbles In My Sump

I have a sump on my saltwater aquarium which is fed by four overflows from the main display aquarium.

This sump contains a deep sand bed, a refugium and all the equipment which can be hidden (heaters, return pump, protein skimmer, calcium reactor and auto top up)

For some reason and I don’t know why I have suddenly started getting loads of micro bubbles in my sump.

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