The main thing to watch out for with petco is disease. They generally run all the saltwater tanks from the same sump so if even one infected fish is added to the system, it can infect them all. Inspect all fish for parasites or disease even the ones you arent considering buying, just to make sure you arent taking any ich home.
The dead fish dont need to be as big of a concern as live diseased fish. Theres enough gallons of water mixed in their system that asmlong as it isnt decaying, it shouldnt be so harmful to the other fish. All stores experience loss of fish, its just easier to hate a chain store like petco than a small local business. Ive had some great fish come from the petco near me and they always have the broadest selection of fish and inverts. They also seem to be the only store that stays in business without massive price spikes.
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