Originally Posted by
Nuggetz
Check run off with a ph pen, it's possible your ph has dropped below 6 within the soil, due usually to overfeeding or not getting enough of a run off when feeding. If this is the case it won't matter how much extra cal/mag you feed the plants, they won't be able to uptake it from the roots.
If you find the ph to be low I'd suggest flushing the plants through with 3x pot size water with half strength of nutes to what you normally use, ph'd to 6.8 and see how they respond.
It's better to simplify things by bringing them back to a baseline you can build back up from. No big deal if it's a bit under fed but if it's a ph lockout within the soil it will need adressed. If they look to respond well then just ease up the feeding gradually until they become green again but don't overdo it.
And if you do flush them, wait a day then remove any yellow/dead leafs.. That way you'll know if the plant is recovering or not from that point onwards.
All the best
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