Almost any commercial potting mix will do. There is no trick to it. But you can screw-up a commercial potting mix by adding shit just to add shit, too.

Even MG soils (which I first learned to grow cannabis in) are fine if you adjust your nutrient schedules to reflect those additional nutes.

IMHO, compost isn't potting mix. It's an outdoor soil ammendment. Chicken compost, horse and cow compost, mushroom compost...none are any good on their own, but under the right conditions, are a good addition (component) to the soil.

Regardless of the potting mix you chose, I'm sure we can talk ya down from taking the hydro plunge. (where all you'd have to change...is everything)
I'd go get some potting mix, and try again, with a little help from us along the way. :jointsmile:
Rusty Trichome Reviewed by Rusty Trichome on . flush water ph, how low can you go? Hello fellow enthusiasts! Hope everyone is having a wonderful Saturday :thumbsup: yea...i've read as much as I can about flushing etc, but how low can you go with the pH of the water you flush with? I'm asking because it seems to not be working. It comes out at like 7.7 after a couple rounds... wayyy high, and the water going in was 6.5...then I lowered it again to 6, and flushed a couple rounds through it, and the lowest I've got it to is 7.5-7.6 what the hell is the deal? (This is in Rating: 5