Yah! Those coagulants (water clarifiers) will always drop the pH. Rather than trying to add pH up to tank, how about boost the pH of the new water for WC. As far as cloudiness, as long as Ammo,
nitrite are Zero, should improve w/i short time all by itself.
Provided Ammo, nitrite are OK, could change the filter media and add fresh carbon which will help you clearing of water. Besides all the particles (coagulated) are on the filter media and should remove before they breake down again. what ever you do , do not boost up ph too fast either.
In case ammo is present, DO NOT raise ph until ammo issue is resolved ( by partial water changes).