I don't know what's in my tap water but it should have all the essential minerals, I live in a clean mountain area.
Anyways if you wish I could look up online if I can find some analysis. In the meanwhile this is what my CalMag contains:
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I agree on the less is more, a lesson for the future.
I will give 1tsp/gal next time and see how it goes form there. One question tho... If my calmag is not garbage, it should be enough by itself right? Or is it always advisable to add a lil bit of epsom in flower?
There are 2 charts to look at. The one you saw is for AllMix soil, which is way hotter, hence the low dosage.
LightMix soil follows another chart, alongside coco:
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