Your best bet is to buy those feeder and quarantine them for a period of time before you ever use as feeders. There is no fish shop that is known to sell healthy feeder guppies cause when the fishes are crammed in the small plastic bag, no matter how their state of health are, they will deteriorate over a short period of time. Alternatively, try to feed your fishes with frozen feed, which to me, is much safer and more convenient.
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