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Good soil probably had Dolomite Lime and no Ca is needed for the entire grow I am just reading your plant. How it got out of balance is just guess work. Soluble gypsum, and any other nutrients like N can build up especially in soil that needs little to no run off. What you need to remember is I am 100% hydroponic and I get 20%+ run-off every day. Then at res change I run at least 200% of volume nutrients from what was remaining in the res diluted with enough water PHed to 5.8 to get down to ~400PPM. I run this through the rock wool 2 hours prior to lights out. There is no possible chance for any build up. 2 hours after lights on the plant gets fresh in balance nutrients. Yes I use a lot of nutrients. When I was using House & Garden it cost nearly $500 for a single grow. The plants did great but $1.5K a year for nutrients is too much. I am running about $70 per grow now. I might be less since I have bought larger bags of the stuff I use.U do realize i am referring to the same soluble gypsum powder u use right? 50ppm added into my nutrient feed or 1/8tsp! And i will need to purposely waste nutrients if i cut it in half cuz several ingredients only get .1ml as is so trying to cut that in half isn’t feasible! Also it is kinda in half cuz its supposed to be an every other feed thing but i do it once a week only! There is only 2 amendments that each have .5 as the N value of the NPK! I can cut them out tho or cut one and reduce amount of other! This is better soil tho so possible it is ok on CA and i should just supplement missing Mg from using RO! I am glad that outlier isn’t being so picky and is seemingly happy with feed rates how they are!