Yes, sorry if that wasn't clear.
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Run the pump all night if you think there's a chance you'll have frost but 50s day 30s night shouldn't freeze your new pool.
Dave is right. Briefly dipping to 30 isn't usually a big deal. Now, if it went to the mid-20s for any length of time, you might have a problem. If you have any concerns, then just run the pump overnight or put it on a timer to kick it on briefly a couple of times during the night. It wouldn't have to run very long.