I did the test on a fresh cut red milli.
Using the reference below, I calculated the amount of water I'd need for 1 teaspoon of KCl. That came out to be 1/2 gallon of tank water.
Here's the fresh cut from my tabling red milli before placing it in the dip:
Notice that it has white tips. That's its normal growth pattern.
I then put some in a bag and floated it in my frag tank so that the temperature would remain constant:
After the 30 minutes were up, I put it on plug, and took a picture of it from my DT:
It looks totally happy!
I'll post a picture of it tomorrow so you can see the progress.
Mass-Volume Equivalents of Common Chemical Solids