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Brown spots is classic calcium deficiency .....interveinal chlorosis is magnesium deficiency with yellowing leaf veins.....
Running multiple strains , you`re bound to find deficiencies in some plants while others look good , it`s just the nature of the beast when not monocropping.....anyways.....I used botanicare cal/mag to help my setups , but it was coco and not hydroton.....
Try 2-3 ml per gal and see if the spots go away on new growth , and an old head tip is not to do away with veg nutes until after couple weeks bloomage to help stretch and create more foliage and budsites....
Good luck....DHF....
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If your ph is rising without ec going down equally , then you`re feeding too much.....and not sure about ph imbalance , but if you`re chasing ph constantly with ph down , IF it`s phosphoric acid , you could be causing a calcium lockout with too much phosphorous in the mix from dropping ph down regularly without the plants assimilating nutrients.....
Obviously they`re doin ok and only time will tell , just keep a record of how tall they are when they stop stretching so you`ll know how much longer you can veg next run....or not.....anyways....
Plants look healthy and with every new setup there`s always a learning curve before dialage occurs....good luck and....
Peace....DHF...
