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Your tanks are way too small for goldfish. In my opinion, comet goldfish should not be kept in tanks at all and should be in ponds. If you must have goldfish, I would keep 2 of them in a 3ft tank (30US gal) minimum.
I don't think your goldfish will survive until Feb, despite all you are doing to help them.
Are you able to return them to the store your mother purchased them from, and get more suitable (smaller and less messy) fish?