I never knew you can feed your rays with feeders.. Not that I want to feed mines with it, but just watching them catch one looks awesome..
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I think that's exactly the point of the statement; those particular fish (cold water goldfish feeders) are not the right fish . Nutrtional value is poor & prone to disease. If you breed them or sufficiently quarantine, I guess an ocassional treat's ok, but most FW trops need a varied diet of much more to be healthy. "T"