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At the beginning of the week, there were signs of potassium deficiency, I added 100ppm PK13 -14, but the deficit progressed, so I increased it to 300ppm.
Last week, rust spots appeared on the upper and then middle floors. I regarded it as a potassium deficiency, added PK 300ppm, but the spots quickly progressed. After a hint in the comments that this is probably a calcium deficiency, I prepared a solution: 60ppm water + 220 ppm calmg (previously added 140) + PK 120 + base. The spots continue to increase, but at a much slower rate. In general, the weight gain is going well, so I don't worry too much)
For the first half of the week, I tried to stop the progression of calcium deficiency: I increased calmg to 300 ppm, raised pH to 6.2, and reduced PK. But there was no effect. Then I decided to change all the food, replaced it with meniralnoe. I bought another calmg and pk boost. This helped, spots stopped progressing.