Seems a bit low. Mine is always at about 8.0 with seachem salinity and I've never had problems but I'm not sure about 7.7. pH is affected by a lot of things including temperature, dissolved oxygen, calcium concentration, and magnesium concentration. Make sure you have lots of oxygenation. Other than that I'm not sure what to say but I bet that adding a buffer will only be a quick fix and it's probably more of an environmental control that is causing your low level.
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