Are you using soil? Soil lowers pH. If you are keeping cherries, you can do without much soil. But than again, if your tank is mature, it is not good to change it's base directly, unless you re-setup.
Coral chips can work quite fast. I would rather put it into my aging tank (whatever storage you use for aging, eg bottles). This way, it is easier to control pH. Adding CC directly into tank is ok, but if you add too much and the pH shoots up, you have to bring it down again.
I had brought up e pH in my new tank (no shrimps as of Saturday), from pH 6.5 up to pH7.5 within 1 day (a tub of CC). When I realised the pH was on the high side, I remove the CC and did a partial WC (abt 10%). This is to bring e pH back down a little. I can do that b'cos there is no shrimps when I was adjusting pH. This tank doesn't use any soil.
I just released some yellow shrimps into the tank yesterday (after adjusting pH). They appeared to be doing fine this morning.
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