Stunted + nutrient burn?

LawnXweeds said:

Another less positive update, hopefully I can get some more generous help. The problem does not seem to be going away.

I've been using strictly RO water since I noticed these issues, but that has only been 3 waterings since I made the switch back. A local grower at the dispensary my wife goes to suggested a home made Cal/mG recipe consisting of ground egg shells and epsom salt (6 egg shells powdered, 1tbsp epsom, 1 liter of water), so the last 3 waterings for both plants has looked like this:

(thing1 is the plant in my OP, thing2 is my other plant that I've not yet mentioned until now)
2/15
Topdressed both plants with a couple inches of worm castings mixed with Indicanja to keep it airy

2/17
Thing1: .5 gal RO water + .5 liter Cal/mG mix
Thing2: .5 gal RO water + .5 liter Cal/mG mix

2/20
Thing1: .5 gal RO water
Thing2: .5 gal compost tea (brewed 2gallons water using worm castings, Purple cow compost and a couple cups of Dr. earth "homegrown" organic fertilizer. Brewed for a few days)

2/23
Thing1: .5 gallon diluted homemade Cal/mG recipe
Thing2: .5 gal RO water

Purpling stems on thing1. taken today
View attachment 4487816
Yellow spot on thing1. Taken 2/22
View attachment 4487818

brown spots on thing2. taken 2/20
View attachment 4487820

closeup of brownspots on thing2. Taken today
View attachment 4487821



I am at a loss here. Did I screw the soil up with my tap water? is it possible that I did not fill the pots enough initially and the plants have already used up all the nutrients? There has been new growth in the last two weeks, but not much. These plants have been going since early December, but in this medium since early January.

Help me Rollitup Kenobi, you're my only hope.

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