Orange spots, leaves twisting on edges

Hi and thanks for looking and possibly helping.

These seedlings are about 10 days old and in an aeroponic system. They had no nutes when this started to occur and I'm thinking this may have been a pH related issue but I'd like to be certain. As you can see there are some orange spots and the leaf edges are twisting. My temps in room are between 70-80. Plants are growing very fast however this showed up about 2 days ago. I checked the pH and my res had climbed to over 7 (YIKES!) so I changed it out and put it back down to about 5.5

Any one have thoughts or seen something like this before?

Thanks,
DP

That's from the PH fluctuation and it will be OK as long as you've got the PH corrected now and do not let it fluctuate regularly.

Cool - thanks for the input! It's reassuring to know the problem is what I diagnosed it as.