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How old is the 28g tank? Do you have live rock and/or a substrate in it?
Generally, once established the LR and most substrate will help buffer the pH to correct levels. In new tanks, this takes awhile as the cycling will lower pH.
If this is an older tank, you may want to test your alk level. This plays a big part too. If alk is good (my tank is happy at around 7dkh, tho the range can be between 6-14dkh) and there is decent surface agitation of the water, then pH should buffer in the 8-8.2 range naturally with regular water changes.
Generally, once established the LR and most substrate will help buffer the pH to correct levels. In new tanks, this takes awhile as the cycling will lower pH.
If this is an older tank, you may want to test your alk level. This plays a big part too. If alk is good (my tank is happy at around 7dkh, tho the range can be between 6-14dkh) and there is decent surface agitation of the water, then pH should buffer in the 8-8.2 range naturally with regular water changes.