Realllllly low pH in QT tank...Can't figure this out

[GreenSpottedPuffer]

Originally Posted by Johnny Reefer

We have different QT methods then.
My QT tank is not cycled. In fact, it is empty when I'm not using it.
When I start it up, I do a water change on my display tank. The outgoing water goes into the QT tank. I then mix up a 5g bucket of new water. The next day I start doing daily 25% water changes to the QT tank. It's a 20g tank.
I drain 5g from the QT, siphoning any uneaten food at the same time.
Then I take 5g from the display sump and pour that into the QT.
The new 5g batch goes into the display sump.
Then I mix another new 5g batch for the next day, and so on...
This method helps keep ammonia, nitrites, nitrates and pH in check.

But you mentioned hyposalinity, so I suppose this method wouldn't work for you. Maybe try it without using display water. Just the new water.

At any rate, I think you should try daily water changes. JMO.

Yeah everyone has their opinions. This has worked for me for me for years and I have never lost a fish in QT. Im not interested in that much work to be honest when having a cycled QT tank works just as well. I never treat with copper or any other meds that could harm the bio media.

There is a PH problem this time though...still not sure why.

[Sebae again]

Low Mg can cause low ph.