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Hi There,
Goldfish are very tolerant fish, they can live in water from 42F to 84F.
They should not be kept in a 10g tank.
A Single Goldfish needs a 55g tank to live in, add 15 gallons per additional fish.
Your best bet to keep them inside for the winter would be to get either
a large rubbermaid tote bin or a large garbage can. Rinse well, fill with
water treated with water conditioner such as Prime to remove chlorine, chloramine and other toxins.
Add an air stone and voila!
Do water changes of about 40% once a week.
This should suffice for the fish for the winter.
I wonder however, why would you bring the goldfish in for the winter?
If the pond is deep enough to avoid freezing solid, they should be fine for the winter outside.
You can also buy a heater for ponds that just keeps it from freezing. They are relatively inaffordable compared to buying a large tank to keep these fish in. Check all purpose country stores and pond supply stores.
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