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You can keep a small powerhead in there or airstone, but I wouldn't keep using the same formalin dip over and over again day after day. Using it for all the fish in one day would be fine, but you should probably throw that away and use a fresh container, water and formalin if you need to do another dip.
Last question, when doing the Formalin dip, can I use fresh SW, or do I have to use tank water?
Thanks!
Salt