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Is this salt build up or mold ?
gottagrowsometimeanswered grow question 10 months ago
Its enzymes that had little access to air movement been fiber pots they should have good air flow around them pal. As if you use these pots. Been breathable if you're blocking 50% of the pot it can only do 50% of its job.
All you can do is increase airflow around your fiber pots.