how often do you guys feed calmag?

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I would add it in on every feed if your in a hydro setup, soilless or liquid nutrients. Coir like said below is especially bad for robbing a lot of the calcium and magnesium out of the soil. Can follow the recommended dose guides for it and if your noticed a small need for more increase it for a week. Bring it back down to normal as the levels up in the medium will be saturated now. as the plants get bigger though they will need a tiny bit more. nothing crazy though. 1ml/l to 2ml/l Best Of Luck!

According to most trusted Coco grower by me here @Roberts , you add a bit in every feed. O.25 ml with every feed not watering will prevent you and stimulate her ;) All the Best !!!

In coco it needs to be added regularity. Either add a little every watering or add a little more a few times a week. Robert's has the feed for coco nailed, so he would be a great person to know exactly how much to give. Just remember it is also high in nitrogen, so don't over do it.

@ganjermaster I would suggest weekly would be the best option mate prevention is better than cure