150 is somewhat high but I would leave it. It will come down over a long time meanwhile I think it will be just fine. Monitor your TA and pH for the next few weeks but I'll bet you are fairly stable.
My TA has been high for a while too, but it has SLOWLY come down on it's own to around 150 as well. My PH has also been steady, around 7.0 . Low, but steady. The water is clear and it isn't uncomfortable so I've not added any baking soda yet.
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