hi, all are clones cut from a healthy mother plant about 3-4 weeks ago. once rooted they were fed formulex whilst still in rockwool cubes. they were put into clay pebbles in a flood and drain tray about a week ago with ferro A and B nutrients, Ferro enzymes, Ferro root stim, Ferro bio crop a few drops of superthrive and some growth technology silicone. they are under a 4 tube T5 lightwave. EC was set at 0.8, ph 5.8 i was away for a few days, came back and the EC had gone up to 1.4 and ph 6.2, i noticed a little bit of nute burn on the tips of a few leaves but apart from that they looked good. i reduced the EC back to 0.8. the light was about 4-5 inches away. a day or two later i noticed the yellowing and spotting appearing, EC was still 0.8. i have just run two nights of plain water at ph 5.8 to flush the system and moved the light to about 10 inches away then taken the photos you see, i dont see any improvement. is it nute burn, nitrogen overdose or maybe heat? are they likley to recover or do i need to start again? thanks for any help you can offer.