Gold yellow spots on my seedlings, what might it be?

Hey guys,

First time grower here. I have two seedlings right now set up in a grow tent, my very first operation and I want to make sure I diagnose any issues as quickly as possible. I've noticed some yellow/gold spots on one of my seedlings that I suspect is related to light burn but want to make sure. Below are the specifications for my grow:

Time so Far: one week in soil
Soil: Nature Care Organic Potting Soil (I know some people are going to be upset with this, but it's what I have, its inexpensive and i wanted to try my best with this)
Nutrients: none, since I've read I should avoid nutes for 3-4 weeks
Water: distilled water, I've been watering every other day, ph level is around 6.
Tent Size: 3 x 3 feet
Grow Light: viparspectra 300w set at a height of 30 inches as the manufacture recommends 26-32 inches (i've moved the light up to 31 in case)
Temperature Range: I have it maintained at a range of 70-85 degrees Fahrenheit
Humidity Range: humidity has been harder to control, it's now ranging from 57 - 70% but 2 times the humidifier was set accidentally too high and for 5/10 minutes hit the 90s. Wondering if this may be the issue.
Ventilation: I have two fans running, one blowing near the plants and another exhausting

I think that should cover it, I have a picture of the soil ph level as well. Any ideas how I should proceed? It's my first grow so I knew I would run into some issues.

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There’s no calcium in those water sources. Tap water is fine for growing. Forget the claptrap about chlorine. Also suggest accessing the latest quality analysis of your municipal supply. It will be online.
 
Thanks for the feedback. So I am aiming to fix a calcium deficiency by switching to a more calcium rich water like my municipal tap water and pH up as well? Just making sure. Thanks a lot man.
 
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