The Activera is a general plant growth stimulator that can be added to any feed regiment, either soil or hydro so you can mix that in at its suggested rate. The biobizz Cal mag should be fine to use too, nutrients and supplements can be pretty much mixed and matched as long as you end up with the correct final ratios. Since your Canna Coco already has added Cal Mag you most likely won’t need to add more now that you have increased your EC a bit… If you choose to I would only add like 1/4 the suggested rate. You can always bump it up more later if necessary. You might not be able to discern any results until you have new growth as those ever-so-lightly yellowed tips may not re-green and you will need to monitor your new growth to see if there has been any change. I think you are good to go for now.
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