I need help...advanced growers reply only.

[Psyclone]

Gah...hard determining what the problem is...at first I thought it was heat stress...then potassium...I tried solving both those problems but it continues...what's happening is the leaves look like they have nutrient burn...the leaves are losing their color to a light green then yellow...I'm using a 15-15-20 solution...only use it once a week for the plant, the rest of the waterings are with bottled water. So yeah, help? lol

[Dr. Greenthumb]

maybe your PH is off or soil might be to acidic

[Psyclone]

Really?...damnit, I need a tester...used to have one but got confiscated on my last operation lol

[Dr. Greenthumb]

if your not monitoring the PH that's most likely what it was especially with the symptoms you're describing