first time outside of soil and was having really wild ph fluctuations and root rot (the AC failed once and temps shot up to high 80's, water in the 80's also) but I brewed some tea(and brewed more right after pouring it in, kept doing this for a week+, then just do it about once a week now) and I have a ton of nice white roots and no more ph problems. tea probably only helped one problem and that helped the other but still.