i just saw the black gold stuff today but i just went with #4 cause im behind schedule and i get a bail for 30$ about 7 cft. anything else would cost me double.

i did pretty much the same nute prep as you, then i bought a meter and now i have ph prob

got my stuff and now am gonna build my bed. i think im gonna go 2'x 2'1/2 x 10'' and make two, or do you think just a single 4x4. with two i can alternate harvests. have you had any probs with root space