Originally Posted by Rusty Trichome

Why are you mixing the coco in?

TO AIR OUT THE SOIL. BAD IDEA?

I'd flush well (two to three times the pot volume) with 6.8 ph water.

SOUNDS GOOD SHOULD I DO THAT FOR ALL THE PLANTS OR JUST THE QUERKLES?

Mix per soil applications, not hydro. Big difference in needs.

YOU THINK I'VE BEEN GIVING THEM ALL TOO MUCH NUTES?
If feeding daily, you are building-up the nutrient level to toxic levels and dropping the ph. Likely getting a salt build up as well depending on the nutes.

I'VE ONLY BEEN FEEDING ABOUT TWICE A WEEK
6.3 to 6.8 ph for peat based soil (and peat based soilless) mixes.

I'd back off the additives till they are looking better.