First grow. Bubblelicious Seedling. Uniform Spots?

I'm on Day 14 of a microtent-in-closet grow and she seems to be doing okay. Noticed some very small uniform white dots on the leaves and just wondering what it is... don't think it's mold as it's not patchy/powdery, but maybe something that needs to be addressed? Also noticed some slight yellowing of the leaf stem.

My setup:
3.5 gal bubble bucket w/ 6" netpot, hydroton, T5 veg lights (24/7), two 4" air stones, 2 fans
Seed was germinated in bucket (Rapid Rooter plug)
Temps 79-82 deg with humidity in 39-40% range

I gave her some very very minimal amounts of silicon, nutes and cal/mag a couple days ago which is probably too soon upon further research, so i topped off w/ more RO water and checked ph w/ readings between 5.0 and 6.0 (although when testing i often get a pink solution which makes the ph almost impossible to read!) Also been keeping the res cool with an ice pack in a ziplock bag once or twice a day when it feels too warm, since my small tent keeps it kinda hot in there...

Any thoughts?

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