normally my pH is a little above 6.5 but not 7. i have drift wood in there which was the likely cause but i added a new piece about two weeks ago and my pH was 6.3, which was a bit too low than i think they could handle so i added some small bags of crushed coral to the filter box to help with it. i normally have hard water with a moderate KH, but when i checked my pH just now is was around 7.2-7.5. ive already moved the worst one the panda to quarantine. and ive added salt to both my main tank and the quarantine. what should i do from there?