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Just feed them when you can and don't worry about them. You mention the pond having plants ect, the fish will eat them and the algae.
Given you are in Victoria (poor bugger) and the nights are getting down to near zero (poor poor bugger) with the days not much better. Oh my, did they forecast 26C here today?????.
Anyway you will find that in the cold weather goldfish eat very little. Over winter my outdoor goldfish are lucky to get fed once a week. ( the ice forming on the surface could be a problem unless you are into ice skating)
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