Happy Birthday ICMag! Been 20 years since Gypsy Nirvana created the forum! We are celebrating with a 4/20 Giveaway and by launching a new Patreon tier called "420club".
You can read more here.
Important notice: ICMag's T.O.U. has been updated. Please review it here.
For your convenience, it is also available in the main forum menu, under 'Quick Links"!
We need more information to give accurate replies. Feed pH/EC, nutrient mix, temperature/RH, watering frequency, etc.
Offhand the pots looks dry and something you are doing is causing pH swings in the medium. Likely too much of a dry/wet schedule. Moist/wet is better for coir.