You know i was told to get a air pump really small want and do like an air stone people said that’ll bring it up alittle but make a lot of salt all over think it’s worth it or notNot many ways to raise ph if you had a skimmer you could use a co2 scrubber. kalk will raise it also you can drip it or use it with an ato. Ph of 7.8 is not horrible coral will definitely grow better with a higher ph but it's not that big of a deal.