I use 5-7 gallon black tissue pot 18 under 4.5 feet x 9 feet .Old Recycle promix with compost and dolomite lime powder added every 6 month. And i add perlite when needed 33% .
When my liquid karma will be finish ill buy powder humus to replace it.
Veg mix
Compost tea 1 time
Megacrop 4g...