Please help!! never come across this problem!!

i got some barneys blue cheese going, all just sprouting second pair of true leaves. I germinated them in pete pots surrounded by clay pebbles. I am using a bubbler system and all seemed to be going well untill a two of them started looking weak. They have a definate purple colouration UNDERNEATH the leaf, with the tops looking perfec tly healthy. I thought i was a phosphorus difficiency, but the sides of the leaves are fine. They then slowly willted and stopped growing. they have now shrivled, but want to save the rest from this problem. Iv researched, but havn't heard of anything like this. using 600w HID lamp, temps quite high, could be that, as well as lack of nutes, but the signals im gettin don't relate. any help welcome.

how close is the light and did the pots have roots coming out before you put htem in the bubbler.

pics would be good

smppro said:

how close is the light and did the pots have roots coming out before you put htem in the bubbler.

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lights about 25inch above with reasonable ventilation, and roots were coming out bottom of pete pots when placed in bubbler. The heat is to high, but it doesn't explain the purple underside of leaves.