I’m just gonna do the right thing and quarantine.. I picked up a 10 gallon kit from petco for $25 LOL
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If your are going to have more than just a few fish I would 100% quarantine all incoming fish. One fish can ruin it all. In my old tank I had plenty of fish that were doing great for years, I added one new ”healthy” looking fish, and within 48 hours I lost a purple tang, chevron tang, sail fin tang, and a few wrasse.
just make sure you carefully monitor ammonia with a qt tank that is only 10 gallons, it is much easier to overload a tank that small. You should only have 1-2 fish in it at a time in my opinion..