Deficiency on a clone? Picture included!

One clone in my 30 site EZ Cloner is showing some silver and brown spots. Used a 30x loop and saw no signs of Thrips or other pest. Only can assume its a nute issue. My water is pH 6.2 and water temp is 72. Thanks!

2011-03-19 22.04.16.jpg
 
does it have roots? usually nutrient dif. is a sign to transplant.

It's only been 2 days...but, no, no roots. There is one other that is starting to show similar signs, but all the others look okay. I was just doing more research, could the lights being too close cause this? Thanks.
 
ive noticed my clones sometimes start to look deficient right before they start popping out roots...

they get slightly yellow and spotted
 
ive noticed my clones sometimes start to look deficient right before they start popping out roots...

they get slightly yellow and spotted

That is interesting. I do not really have a choice at this point. I was considering removing the bad ones early, but since no one has suggested that it is a disease or pest issue, I am going to let them ride it out to see what happens. Thank you.
 
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