Also, what is the pH of your water. I thought I needed to flush my plants a while back, so I flushed them out with probably 30 gallons of water....

I bought a pH meter the next day and tested my tap water (the tap water I had just flushed with) and it ended up being 8.5. Long story short, the only time my water is the right pH from the tap is when I add nutes or ph lower. You may have just flushed your plants with a bad pH, similar to how I did. Just my 2 cents