Is this mold or what?

What is this thing? Flowers are mid flower and I only just noticed that humidity had been swinging as the lights went off.

What can I do about it?

Gorilla599 said:

What is this thing? Flowers are mid flower and I only just noticed that humidity had been swinging as the lights went off.

What can I do about it?

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Looks like mould mate you need air flow and plenty of it. Get rid of the mould and maybe a light watering with some h2o2 if its coco and not organic. this will kill any nasty shit. I would try to vent the room more when the lights are off also to drop that humidity.

If you do the h2o2 flush it like 30 mins after with ph'd water with calmag

DustyDuke said:

If you do the h2o2 flush it like 30 mins after with ph'd water with calmag

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What percentage h2o2 do I need?