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
stinkyattic Reviewed by stinkyattic on . please help me save my baby! well, right now i have a major problem on my hands as you can see, my one plant that is now almost 1 month old is starting to change a intense yellow color mostly on the inside of the actual leaf. not the tips. the yellowing is really only happening in the new top, and branched leaves. i figure it has something to do with my water, should i boil my water from now on? please help me. Rating: 5