What products have you been putting in your water?
That's the most common way to end up with completely unstable water parameters- add chemicals. Did you neglect PWC (partial water changes) for a long period of time?
I'd get your LFS to verify your test results first.
IMO I'd do lots of small PWC. Say daily 25% for several weeks. If your tap pH truly is 8.8 and your tank pH 4.5 that's going to be the safest way to slowly bring your pH back up. Go quickly and you'll kill your fish.
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