Just share my experience with all. As mentioned before, bought a bag of Japaneses soil (as shown in the picture), after a day to let the water stabilize, checked the PH drop to 6.0, PO4 drop till 0.3mg/l, & KH at 2 degree. And, some plants & shrimps shows more active now. Well, not a bad choice of this soil instead of ADA's soil..........
