You said the fish is acting normal in the QT so that tells me its okay. You can put it into the big tank just use a drip acclimation process. That is what I would do. If you drip acclimate them and it happens again then that would probably rule out the Ph as the issue. You would want the water from the big tank to drip into the holding bin (whatever you use to transfer from QT tank to big tank. Tupperware works well) such that it takes 30-45 minutes for it to double the volume. This will slowly lower the Ph to the big tanks Ph. I have used airline tubing pinched with a binder clip to do this, it works well once you get the flow adjusted how you want it. It would also be okay to remove some of the water about half way through this, which will help the process even more by tanking out some of the QT water.
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