Weather loaches could be fine as they are coldwater fish, as is your goldfish. I don't know of any other coldwater fish, so can't recommend any other and personally wouldn't recommend tropical fishes as their requirements are different.
When keeping goldfish with other fishes, two things come to mind. Firstly, other fishes should not be small enough that the goldfish could swallow. Secondly, be sure to provide enough food for other fishes because goldfish, as you would have already know, is a voracious eater.
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