Leaves dying and curling up - Help!

[fourxfour]

Leaves started doing this about a week ago. Thought it was nut burn so I flushed the soil and it seemed to help for a few days but has only worsened and now the other plants have the same problem. Plz help! don't know what the problem is?
1,000 watt HPS
Fox Farms soil
4 weeks into flower
5gl pots
soil ph 6
flushed with 4gl fresh water, ph 7
temps 75-80 deg
humidity 40-50%

 

[zBRiCKz]

Pretty sure that's nute poison.

You need to flush it with 2-3 times the volume of pot with water. 5 gallon pot would be 10-15 gallons.

Make sure the water is Ph'd to 6.5.

 

[Onsourtne]

oh, plant feels bad. How did you get on?

 

[fourxfour]

Pretty sure that's nute poison.

You need to flush it with 2-3 times the volume of pot with water. 5 gallon pot would be 10-15 gallons.

Make sure the water is Ph'd to 6.5.

Thank you for the reply. I mistaken how much water to flush them with.
Is it okay that I have only watered them with RO water?
Can I flush them with tap water ph'd to 6.5 or RO water ph'd 6.5?
Thank You