:smokin:1>>>The water you are using is most likely the reason your ph fluctuates so often...If properly set-up, with good photsynthesis, you shouldn't have to adjust your ph everyday...Mine stays consistant throughout the week.
>>>remedy: Buy a $90 reverse-osmosis unit off ebay. I did...Matter of fact. If you search my early threads then you will find a pik or 2 of mine..It is the same quality unit that sells for about $250 on the street.

2>>>every 7-10 days...with top off in between.

3>>>65-72 degrees is a comfort range. Cold water holds more oxygen than warm. Do you have your rez oxygenated?

4>>>you want temps between 70best-80max degrees
humidity btween 40-50%. Exhaust should run whenever your temp/humidity values go beyond the rates above; whether the lights are on or not. And you should have a small circulating fan on at all times. Keep in mind...High humidity can cause problems also, and occurs mostly when the lights are off.

5/6/whatever>>>You have fried these plants. The fact that you have to add water to bring down the EC/ppm's everyday means they cannot wait to drink water...leaving the nutes, and causing the EC to rise. it may have been high rez temps..It may have been the Algae. From your piks, I would almost say trying to finish this grow would be a waste of time. But, If you must try; You should flush the system for 2-3 days with ph'd water only. If you don't have RO, then use distilled water.

(be advised...You can buy a RO unit and make your own water, for the price of 3 weeks of distilled water! Get it?).
Then add a 1/2 strength batch of nutes to reacclimate the plants to nutes for 1 week.

The following week (if they are still alive/You should see nice new growth and new white fuzzy roots, (10days)), Mix nutrients full strength and continue grow.
So flush 3 days, add 1/2 strength nutes for a week, then if you haven't "KILLED" them and they show healthy new growth:thumbsup: ...Add a full strength dose of nutes and move on.

cover your rez completely to "dark" otherwise algae will find a way...

Oh yeah...What do you need a water heater for? Is it freezing outside in your grow room?

Is that an NFT system? I don't see drippers...or is it aero/sprinklers?

15 minutes in 3 hours is not often enough to water. The roots will dry up before you feed them, If that is NFT...I run mine anywhere from 45-1:45 minutes with a 15 minute off time when lights are on...and 15 on 45-1:15 minutes off when lights are out.

What week are you in? Are you in veg or flower? When did you start feeding them 1/6 nutes?
Oh, by the way;
when changing nutes you should use the amount recommeended by the manufacturer. After the damage I witnessed in your piks. I believe that your plants will not show any growth being fed 1/6 nutes. But, you still should flush, before moving forward...I reiterate...I think they are toast, but I have been wrong before. it depends on how much time/money you want to spend to try and bring these back to life. They will not yield much after so much early stress., and the algae will bring gnats, and then you will be fighting that.

In closing. You are in over your head. You need to do a lot of reading before you move forward...It is a shame too, as you have purchased a nice system. I have given you a bunch of good info that should provide you with enough insight to find the information on each topic you need to study on. good luck. peace lw:smokin: