Don't forget the fact that the fish are starved for days before shipping so they don't poop in the bag. It is amazing that fish survive the trip as well as they do.
First question I always ask the store, how long has this fish been here, second question, is it eating and a lot of times I ask to see it eat. The stores are always more than happy to drop some mysis in the tank. I've walked away from fish that would just swim by the food.
But all that being said, if you own a fish store and you're putting 6 inch triggers in a 20 gallon tank you may want to rethink that...or not...
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