I'm going to keep running it as it is and not make any adjustments for now. PH has been I'm those levels for the last past 2 weeks or so.7.9 low is really not much to worry about but if you want to push it higher Co2 scrubber or if you got a friend with a larger skimmer you can borrow try that, i know running a calcium reactor it will bump it up the harder you run the skimmer pump but without a carx whether it will work or not i'm not sure.
OT - how did you make those legs on the frag rack? did you heat then bend or cut the lower part & reglue??
I used a heat gun to bend the egg crate to make the legs.
