last night i did a 10 gallon water change in my 29 gallon tank because the ph was below 8 and alk was 3.5 after using buffer and making the issue worse. After the water change the levels appeared fine. I used RO rowater from a store machine and Instant Ocean. Tonight the ph is down below 8. The alk is high as is the salinity at 1.03. My yellow star polyps look green and not so healthy and my flaming clam and all polyps are closed. If i've already done a water change and i can not use buffer what can i do to save my lifestock? Do i need to do another water change?