If it's just a few days, don't feed them at all. I often go away for a few days or a week, and my fish are just fine when I come back. I have left them as long as 3 weeks without feeding, and no problems at all. My butterfly fish were the only ones that even looked a little thinner when I got back, but they all ate well, and soon fattened right up again.
You could do a lot more harm by trying a new feeder, or have someone else feed them.
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