From what i've read, it's not a huge deal, but I don't want it to keep creaping upwards. I just tested the following (on my 90 gal)
SG - 1.025
KH - 9
Ca - 640....DOH!
PH - 8.1ish (between test kits and rkl)
All levels tested 2x to be sure. API test kits.
My PH seems to fluxuate between about 7.8 to 8.1 from day to night with my sump light on my cheato for most of the night.
What i've changed recently is using Aquavitro Salinity salt instead of Kent. I was hoping it would bring my slightly lower PH up and get everything else in check...but it has really brough up my Ca. I did dose recently before the water change some 2 part Brightwell Reef Code, but I always under-dose compared to my water volume (probably should have checked more than PH level but thats in the past lol). I don't recall a reading prior, but I highly doubt it was that high. I don't usually dose, just weekly changes and have Kalk in my ATO water.
Tank is mostly LPS and Softies with some SPS (but not a ton, just a few smaller acro colonies and some caps/chalice)
Anyone experience this and bring it down? Would increase KH bring Ca down? Leave it or action???