Sealing live wells

[Kent]

My boat came with two live wells, which is two more than I will likely ever need. I have noticed that when I run the boat that they get a little water in them. If I put a plug in the small hole in the bow of the boat will that seal them off? What about the drain hole, do I also need to seal it? I read on a thread on here to pour RV antifreeze down the live well lines to prevent them from freezing. Should I also do that?

Thank you,
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