That's why it's good to know the PPM...lol. You are probably right with the water but I'm gonna look around a bit, cause like I said I had a plant with a similar problem and I still don't know what it was....lol. I flushed and transplanted like I always do once a month and it didn't get worse.true if its not getting worse it should be okay. but thats the only thing i could think of since hes not using nutes right now. when i was using my tap water i noticed my plants didnt like it very much, with such a high ppm and all. also it skewed my nutrient ppm by 480 ppms