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Is this salt build up or fungus/mold on clay pebbles?

Hi all,
I have a 20 bucket grow going and today i noticed some weird stuff on the clay pebbles when i opened the buckets for inspection. at 1st glance it looked like salt build up but when i used a 60x mag it looks fuzzy , like fungus or mold but cant tell.
and on 1 pebble i found what looks like to me black mold.
what you guys think this is?
4 weeks into veg
i run 3 stage water filter , water temp is 69, ec is 1.6 and ph is 6.1. lucas formula+calmag, Southern Ag, and from last water...

Is this salt build up or fungus/mold on clay pebbles?


from Hydroponics / Aeroponics https://www.rollitup.org/t/is-this-salt-build-up-or-fungus-mold-on-clay-pebbles.1022534/

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