Red spots on leaf

Hello So i think the spots on the front are getting big and deep enough that they're showing through the back now too. To me it looks like the rusty spots from calcium deficiency. Often a calcium is accompanied by a phosphorus deficiency, but is sometimes down to the ph being far from 6.2 which is where calcium is best absorbed. However me personally, I noticed a big difference in my plants once I started using a calmag supplement regularly (at least once a week), i figured my water had enough but the leaves were much healthier after getting a more steady diet. So possibly look into the ph, adjusting your amount of Ca, and then if any other nutes are too high they're locking out.👍