I really wouldn’t worry about it, if everything is in line 7.8 isn’t bad anyway, the airline outside if easy to do and would raise it if you can’t help fiddling (all reefers suffer from this) or add a CO2 scrubber if an airline isn’t an option..
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Don’t mean to butt in the thread but this is an issue I have been having and I have a line coming from outside and it’s still did not help connected to the skimmer or a air stone no changes slight but would still fluctuate between 7.9 - 8.06.
@Jake_the_reefer whats your alkalinity at? I’ve been having issues with my Alk so I’m trying to figure this out. Thanks for everyone’s help.