Tiny Brown Spots on Seedling

Strain: Northern Lights (Feminized seeds)
Growth Stage: Seedling
Medium: hydroton and rockwool
Method: Bubbleponics Bucket with a large air stone and Reverse Osmosis water
Light: 2' - 4 tube High Ouput Fluorescent (3-4 inches from top of plant)
Nutrients: GH Veg, Micro, and Bloom at an 1/8th tsp/g of each (half the bottle's recommended dosage), Cal-Mag at 2ml/g, and Aquashield at 1tsp/g
pH: Began the week at 5.8 now up to 6.5
PPM: 240-250

This is my second grow and on this go round I am going to establish mother plants and clone from them. The pics below are of the first mother plant I have of NL. She is about 2 weeks old and is in a 3 gallon bucket with a hole cut in the lid with a 5 inch net pot inserted in the hole. I started the seed in a 1 inch rockwool cube that is now submerged in the hydroton inside the net pot. The water line inside the bucket is about a 1/2 inch over the bottom of the net pot. I know that might be pushing it.

All in all she is looking pretty good with long, white roots almost touching the bottom of the bucket. I am seeing no signs of root rot and other than the bottom 2 sets of leaves getting nute burn, the leaves are looking pretty healthy until now.

It might be minor but I paid a lot for these seeds so I want to nip this problem in the BUD so to speak. On the pics I circled little brown spots on the leaves that just showed themselves today. From what I read, it is either Cal and/or Mag deficiency but I have both added. I also read that it could be some sort of pest invading the garden. Any ideas from others who have had this issue?
 

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That might just be a little splashed nutes that got on them the leaves look good and healthy green except for the bottom leaf dying and being a little small for 2 weeks I'm a dirt grower though what do I know it's really early to have bottom leaves dying:lol::grin:
 

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Thanks for the reply Danny.

Splashed nutes is what I think I am going with until I see the issue progress. It makes sense too because when I remove the lid to check the roots, water bubbles up and splashes the plant. As of today I am not seeing any new spots.

As for size, it has been alive for 2 weeks but under the lights for 1. Nonetheless, I know if I were using my 400w MH they would already be bigger at this point.
 
Ok so the spots got bigger. Updated pics below. The issue seems to be severely isolated to the lower leaves but a few small spots are beginning to appear on the upper leaves. Any ideas?
 

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