Your water is ok to use. It’s pretty soft so you’ll probably need to supplement calcium and magnesium. The sodium is a bit high, but not too high to be an issue.

Your plant is not needing any supplemental calcium or magnesium. This damage to the lower leaves is not even a nitrogen issue. That splotching is caused by physical damage to the roots. Probably from under watering. Quick pH swings can also cause this type of root stress. All that matters is new growth is healthy. Remove the damaged lower…

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Those pots can allow pests in and I’m not the biggest fan but they do work. If your tent humidity is too high you’ll need a dehumidifier in the room the tent is in and constantly exchange the air. Flood and drain tables with work well with pots like Rain Science has. https://rainsciencegrowbags.com/

It’s never too late to remove lower shaded growth.