I buy Optimal fish food and they have several sizes of pellets. The #1 would work well, but I don't see a smaller bag than 40 pounds on their website...that would be way too much for your size pond for the first year. Maybe contact them and ask for a smaller amount. They seem very good to work with and would likely sell you a 10 pound bag.
https://optimalfishfood.com/contact/I have a koi pond sized water hole that I kept goldfish in.
I'd toss them a hand full of bread crumbs every other day and they were fine until the freeze.
Would this work for FHM?
I tub of bread crumbs is a dollar at Walmart