hello ac, i just tested my tap water ph and its blue. 7.9-8.1 ph. my tank is almost established as its showing nitrates more than 50, but my nitrite is still not going down. anyway, im doing a fishless cycle, and when its finished i plan on puttin harlequin rasboras, corys, and cherry shrimps. i have ph down, but people advised me not to use it. what should i do?