It isn’t good. No current means less oxygen, stagnant conditions mean bacteria create H2S – hydrogen sulphide gas (which is deadly), this will bubble up out of the sea and kill wildlife. It is theorised to have caused mass extinctions before. Take a look at https://www.wired.com/2008/03/peter-ward-qa/ and scroll down to the question on “Permian Mass Extinction” for a summary.
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