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Thanks, everyone, for sharing your time and expertise! I haven't yet double checked dKH from alternate test, but my newly-mixed water tests at 12. I've started water canges. Hopefully I can get fuge set up soon and get good ammount of macroalgae ordered.

Only thing I can think of to offset high CO2 levels is stock the refugium I'm setting up with lots of Macroalgae ... do you think this would have an impact? I'm glad you guys pointed out the dKH issue (I did double check and got same reading), that was my next question -- how concerned should I...

Did some more measurements on this ... initial pH of RO water is at 8.5. Aerated for not even a minute and reading is down to 8.2. I'm vaguely remembering an article listing low Oxygen/higher CO2 in ambient air of some homes causing pH drop (might make sense here in MN during winter when we...

I haven't measured Ca. dKH 28 Good surface agitation in tank and bucket (bucket has aerator making plenty of bubbles). I do have Marineland skimmer (it may be undersized for my new tank -- but used in 75g and no Nitrite/Nitrate issues when in use) pH monitor is American Marine Pinpoint. I...

I've been fighting a dropping pH in my old 75 gallon and now am running into this in my newly set-up 125 g. Trying to narrow this down on my own, I've had my pH probe in a 5g bucket where I've been mixing my saltwater to add for water changes. I have this bucket airated to oxygenate and mix...