????????? ?? ??????: ????????? ????? ?? ?????? ????? ?? ??? ???? ????????? ?? ????? ?? ???? ???, ????? ????????? ?? ?????? ?????? ?? ??? ???? ????? ?? ???? ???Before incorporating h2o towards the tank, it should be sufficiently cleaned. Use an answer of potassium permanganate, i.e., KMNO4 (antifungal agent), to wash the tank and go away it for twen