If you see dead fish in the tanks at an LFS that are being "fed on" by others, be wary! Some stores do not feed their fish, they just let the ones that don't make it do this! While in theory it doesn't sound completely irrational since they will lose fish anyway and "waste not want not". Realistically however, it is a horrible way to sicken the entire tank through malnurishment and disease. Check with the store regarding its feeding cycle and what they feed to see if this is a possibility or if they are just overworked staff.
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