what is going on with my plants? Rust spots

1 is a burberry seed, 1 is a apollo 13 clone and the other is a mataro blue clone. I am useing happy frog soil technaflora recipe for success kit my lights are three 4 foot floros they stay on 24hrs they are approx. 2 months old... on the apollo 13 the leaves are light green and look like thay have rust spots. on the other 2 plants it just looks like rust spots. i thought it was nute burn so i havent feed them nutes in over a week i used tap water that i let sit out for about 2 days uncapped but i still have the problem.. what is going on any help is great... thank you in advance!

How big ya going? might be time to replant and give roots more room.. shot of cal mag and them leaves will all ways look that way till the end

Serenade is great for most molds, i do believe it says something about leaf rust on the back of the container, Go down to your local hydro. Ask about serenade and read the back of the bottle and make sure its right for you! hope i helped.

is the MagiCal in the technaflora recipe for success kit the same thing as cal mag?

if that is "rust" fungi...the ONLY thing I have found to kill it, after losing 40+ plants to it, is a sulfur burner and sulfur prills, I did 3- 4 hour treatments and haven't looked back, my girls are now all over 4 feet tall, but they almost didn't make it past seedling stage..