Buying fish straight from the suppliers has always been 50/50 with death. its not always the best idea and most people don't have access to wholesalers anyway.
Age of aquariums seems to have the best quality fish in my experience. They don't run a full quarantine but they try and get the fish to eat and add some vitamins. They probably have the fish at least a couple weeks in their back room and I like that.
At a fish store you don't always know when they got the fish but always ask them to feed the fish before you buy. take your time, sit there and watch the fish to see how aggressive or healthy he is.
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