You'll need a pencil, some copper wire and a 9 volt battery. Wrap the wire around the pencil a few times with a small bare section pointing off the end, when it's feeding time hook it up to the battery and use your home made Betta prod to train your fish to leave the corys food alone!! Or net him in the tank while they eat..
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I'm not really here... fell in the tank and my phone is just that smart