Glad the forum helped!

You might want to add the acid, or at least some of it. Your pH is on the high end of what most testers can measure, which means your pH is not "7.8 exactly", but "7.8 or higher". High pH is hard on liners, though 7.8 is OK if it really *is* 7.8.

Otherwise, add some CYA -- 0 is too low. ;-)

And, keep your chlorine up. Current levels are OK, with no CYA, but follow the best guess chart as your CYA rises.

Best wishes,
Ben