The first time around it dropped from 11 - 6.5 within a few days. Initially I thought this was from a phosphate remover, but more likely from the tanks cycle?

The 2nd time was this past week, I've had my ALK drop from 10 - 5 within a month. This drop was more gradual at the beginning (10 - 9 - 7 then 5). I was hoping it would just balance out at 7, but it dropped below.


This is all VERY good advice (Thanks!!! :mrgreen:), I just want to understand it a little better. As I read, PH is critical to the growth of corals and I want to get the best results possible. I believe my aeration tests were poor due to the change in temperature and likely my issue is an excess of C02.

I'm running the Reef Octopus reactor, it has a single chamber. Anyone know of a good *mod* to add another chamber? Could I use a TLF reactor or something?

Wes, when you ran your line outside of the house how does this work in the winter? Does your skimmer freeze up or anything? I'm 100% ok trying this, what size of tube did you use?

Has anyone tried to resolve a similar issue with an HRV / ERV? What is the added cost per month for one of these units? If I have a C02 issue in my house, spending a little money to improve the health of everything living in it is worth the investment.

Thanks for your help everyone!

I run a dehumidifier most of the time with the sump doors open. This seems to have no effect on the PH. Unfortunately, I believe my house might be too air tight (previous owner went crazy with heat/cooling efficiency upgrades).

This might be a good idea anyways, it does get somewhat stale in there.