I've only put nutes into the seedlings, not the clones, and a tsp per gallon.

On the clones: These were medical clones and the leaves that look burnt were yellowing when I got them, they just shrivel up and die, but the new foilage is green and luscious

Seedlings: They don't seem burned to me because its only those two bottom-single leaves; the other leaves and new growth looks green with no signs of burning.