No, you don't really need to add anything to the water unless you are keeping them for a long time. I would suggest filling your livewell with saltwater to monitor the bubbles. You can see the bubbles with saltwater much better than in fresh, you want to adjust your regulator to make sure you have as many tiny bubbles in the tank as you can. Then dump the saltwater and do exactly what you did last time. Also, always make sure your filter is clean.
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