I don't thing the glycol shouldn't have any adverse afffect on the PEX tubing, the OxyPEX is the same material inside. The only issue is that you will get some O2 absorption which may increase the rate of corrosion. I couldn't say how big an issue that will be though.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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