Discoloration on leaf tips

I have 3 plants growing in a RDWC system. I noticed today that a couple leaves have some whitish color on the edges or tips. I also noticed that some leaves are only 3 leaves compared to 5. Please look at the pics and post suggestions or ideas please. Still on a very low nutrient solution as these were clones and I added some H2O2 when I forgot to cover the lines in time. Saw some green growing in the lines before a trip and threw in the H2O2 and seemed to work. Came home to a good amount of growth.

Your starving them. The less healthy they r the less fingers they produce. Also they r hot, you can tell by the serrations standing up. Pictures with the lights off would really help

What’s your EC? Running hydro you should know your pH and your EC.

The EC was a bit lower purposely because they were clones and still getting adjusted. The Peanut Butter Breath was a clone with a rough start. Here are a few pics with lights off. Tried to capture them as best I could.

pH was 6.4