Boiling water only kills bacteria; it doesn't change the mineral content, and depletes the dissolved gases.

Your problem looks like.... picture taken under HPS by camera not corrected for it!!!
Solution: Turn off HPS when taking pics, or put the plants in natural light, or just use the flash.

What you describe, and I can sorta maybe see, sounds like a metal deficiency, probably iron.
Fill out the troubleshooting form at the top of this section so we know what you've been doing.

Your post title reminds me of the last scene in Cannonball Run... lol