Let's say you go on vacaton for a few days. I've seen it written that you don't need to have a 'babysitter' come over and feed the fish in your outdoor pond and that comets and kois will go for days without feeding with no problems. Is this true?
Yes, you do not have to feed fish everyday. Plus if the fish are in a pond they will almost certainly find algae, plants, ad larvae to snack on. You could go for more tha a week without a problem. If it will make you feel better you can give them a little extra right before you go.