First time grower with spots

Day 25 of Critical from Royal Queen Seeds in 1 gallon of Sunshine Mix #4. Watered yesterday at 6.5ph. Used cheap ph meter that has been calibrated and have never had any issues. Critical has been a beast so far. Germinated in same container with 2tbsp 4x4x4 Down to Earth fertilizer at planting. No addition amendments since. Had several days of high kPa of 1.7ish so adjusted temp and humidity to 80°F and 70 humidity for kPa of 1.0ish. Had a bug that feasted some on another plant in same tent but I saw no signs of insects or fungus on the Critical and have had sticky traps in there for a week. Ordered a new, better ph meter to test run off next watering. Spots showed up today. Any suggestions on what spots may be would be appreciated.

Sorry, guess this should have been posted in plant problems.

I wouldn’t worry about whatever it is. Might be as simple as a drop of water magnifying light in that spot. I would be looking to up-pot to give the roots more room to grow.

Thanks DeadHeadX, believe you were right. Spots haven't grown or spread at all. Re-potted in 5 gallon. Wasn't root bound but was getting close. Appreciate the help.

Looks exactly like my spots RawDogRick. Good luck on the grow!