Lower 2 large fan leaves have light green blotches with lil crater like spots

• Place: Closet dimensions 4.5ft wide 2.5ft deep 6.5ft high
• Medium: Hydroton
• Nutrients: GH3 bloom, micro, grow, cal mag
• Additives: GH FloraNectar
• Average pH: roughly 5.3-5.9
• Meter: Liquid Ph Tester kit soon to be digital
• Process: Ebb and Flow, Flood and Drain (2x4 table)
• Net Potsize: 8 - 3.5" net pots
• Method: LST (low Stress Training) Considering ScrOG
• Hood: 6" Air cooled tube reflector double parabolic arc white
• Light: 400W MH for Vegatative and or 400W HPS for Flowering
• Ventilation: 8" Oscillating fan, 2 - 5" corner fans, 250cfm Duct blower fan for light
Strains
1. AK-48 (fem)
2. Master Kush (fem)
3. Northern Lights (fem)
4. 2-Ice
5. 2-Luna Haze
6. Spunky

Only 3 of the plants seem to have it. all at different ends of the table. nothern lights has it the worst, and luna haze. the plants are roughly 3 weeks into veg and are starting to form a decent size root mass and plant size. this is the time where they are about to start growing drastically. So just recently i started to notice the plants lower 2 large fan leaves turning over all slightly lighter shade of green and then having light green blotches with little dots in the middle that might be dead tissue.Its weird because only the lower 2 leaves have this problem.. they look like something may have took a bite out of that area. kinda like a mini crater. there is no visible causes like bugs. the spots tend to be in the center of the leaf and not so much around the outside. i just did a res change last night. its only been 3 days since this problem started. what do you guys think?
 
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