You should post some more details on the tank. CO2 drop from degassed, how it's being measured, fert dosing, maintenance schedule, etc.
So this was taken from another post i made tonight asking if my calculations were correct.
(new)ORP: varies between 360 and 460 with it rising during Co2 delivery.
The PH is being measured by the apex and the drop is slightly over 1 full ph point (tonight). though most of the week it's been about .8 or so. The attached pic shows the ph swing in the last 24 hours. Notice the Min and Max numbers at the bottom.
Dosing has been almost nil because i wanted to get a grip on my water parameters first, Which i was finally able to do tonight. The only thing i havent tested yet is Fe. I will do that tomorrow.
Maintenance, 2gpd auto change. However tonight i changed it to 4gpd to try and reduce some of the ca and mg concentrations.
Thrive S states 1 pump per 5 gallons 1-3X week. Now i've halved this and done 1 or 2 pumps or so every other day to equal about 7 pumps throughout the week. I have what "I" consider an extremely low plant load. The last thing i really wanted to do was put way too much in to begin with and battle algae. (diatoms i expect in any new aquarium)
1 cup R.Walichii
1 cup Heteranthera Zosterifolia (hope i got that right) and these guys aren't doing well at all.
2 Java Ferns (i think. they are the ones in the picture above about the deficiency)
2 stems of anacharis
large 30% water changes every other week.
Now keep in mind that after the tank cycled, i did a 100% water change with RO/DI water not re-constituted. I suspect the high Ca and Mg are because there were tube worms and corraline algae on equipment i could not reach during the conversion. My best educated guess would be that when the ph drops from the co2 injection, the Ca and Mg get release from the structures and introduced into the water column. What leads me to this conclusion is every so often the return spits out white chunks which i assume to be calcium carbonate. But this is conjecture on my part.
Just curious why the 2 gallons a day auto water change? That is not much water change for a tank being driven by that much light, and will make it difficult to dial in ferts and keep tank uber clean.
It actually didnt in the reef tank. sure i used more ca/alk/mg in keeping up with the daily usage, but new traces were being added on a daily basis. Much i suspect will happen with re-constituted water for the auto water change (when i get there after having the ca and mg concentrations brought into normal levels)
And really sorry to hear about the water damage. I've got to hand it to you, you seem pretty calm about it and are handling it well. That is a lot to deal with.
Thanks, i beat myself up for about 3 days. But in the end, freaking out and going bonkers doesn't get anything accomplished. I'll get it repaired, it will just take some time.