| What method are you using to check pH? If you are using a monitor, then try to recalibrate it first. I recommend this first for pH issues (with a monitor) when everything else is in line.
The windows don't have to be in the room to eliminate excess CO2 in the house. What you can do to see if it is a CO2 problem is take some tank water in a glass or container. Measure the pH. Then, take that same container outside for a little bit and measure the pH again. That should let you know about CO2. You can also do the same pH test without going outside, but using a powerhead.
Since your tank doesn't have a skimmer, you probably have some DOCs built up in the system. I suspect once you get your skimmer, you will do great. Hang in there and keep saving. I didn't think your pH is all that bad. Remember to post your salinity levels when checking on water parameters. Tank chemistry relies on this. If your salinity is 35 (35,000), that means you have 410 Ca, 1230 Mg, etc. It is a good practice to get into.
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~Nikki~
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