So about 1 hr after I had refilled I re adjusted ph,this morning the ph was 6.6 re adjusted to 6.0.Its now been about 16 hrs from last night and its 6.2.Ppm was 710 last night its now 820
Ok your plants are not eating well. All this root issues could be why as well as those ph fluctuations.
So I take it you don't have potassium bicarbonate correct?
Ph down is GH ph down? I think phosphoric and nitric acid mix if I remember right.
How much have the plants drank? If you top it up with tap water to the level it was yesterday what is the ppm?
Ph that high is going to give you problems. So if no potassium bicarbonate take 1/2 tsp per 5 gal of baking soda and add it to the system this will increase your buffer. Then ph it down to 5.8. this will raise the ppm. The problem is your tap like RO doesn't have enough carbonate or bicarbonate. It's unusual but it happens. So at this point RO become a more viable option. Because we will be adding a buffer to the water. Normally tap water is no problem but as I said not always.
After adding then let the system run for an hour and ph down again.
Bare with me man we will get it sorted
If you have RO and not to frustrated yet you can again empty and fill adding 1/2 tsp of baking soda per 5gal and then cal mag. The reason is cal mag does not contain a buffer and this could have been your issue all along.
If you have silica we can work with that too. But you weigh your options and tell me if you wanna go tap or RO then we will go from there