[Redweasel]

I don’t have an answer, but following, because we have almost the exact same grow style and I’ve been curious myself. The only difference is the base soil I use is Roots Organic.

[Sharpshooter291]

If it ain’t broke, don’t fix it lol….but you could always do a side by side, try with one plant. I tried coco and it’s alright. You have a to get a good quality mixed light one though which is not just ground up powdered Coco, or just the chunks..but..I’ve found peat/soil and adding the coconut husk (just the strand bits) is the best. Something that old gardeners do, tried and tested

[jmystro]

Calcium is the last element you ever want over-abundant. It antagonizes 7 different elements, limiting their availability. That’s a terrible trade off. Only supplement calcium or magnesium when you’re seeing an active deficiency with a specific plant. Most cannabis plants do not need any supplements and will lower yield considerably when you create an imbalance.

[confusedunicorn]

When looking for coco coir make sure it’s buffered. The cal mag is already in it and you won’t have to worry about adding unless you are seeing deficiencies. I use vivosun’s coco coir which is buffered, if your looking for non brick the brand Nutrifield is buffered and has perlite added. As far as top dressing I am not a pro, but I top dress diatomaceous earth with no problem. Hope this helps.