Can any one help identify this deficiency?

Looks like ph swing limiting uptake I have a bad time with that using tap only because local water comes from and calcium rich aquifer. The water is like 9ph even if you correct that with every watering the hard water deposits build up in the median and make the ph swing.

Calcium helps provide structure to the cannabis plant and helps it withstand stress like heat. When your cannabis plant has a calcium deficiency, the main symptom that you’ll be able to notice is brown or bronze splotches or spots on your leaves. It is also often associated with yellowing (though leaves don’t always turn yellow). Occasionally the splotches may appear purple especially under LEDs. Calcium deficiencies are often caused from low pH at the roots, but also occasionally from growing in soft/filtered water. Calcium deficiencies are common when growing in coco or using soft or filtered water, but the most common reason to see a calcium deficiency is low pH at the roots. Some of the most noticeable signs of a calcium deficiency will appear on newer or growing leaves which may display: Dead spots Crinkling Spotting / Mottling Small brown spots Stunted growth Small or distorted new leaves Curled tips Leaf die-off Affected leaves may appear green besides the spots If you suspect your growing cannabis plant has a calcium deficiency, flush your system with clean, pH’d water that contains a regular dose of cannabis-friendly nutrients that includes calcium. This will remove any nutrient salts that may be affected the uptake of calcium and help restore pH to the proper levels.