Can koi survive outdoors in a pond in Germany without heaters or coolers?
How many gallons will I need?
- Anonymous1 year agoFavourite answer
A pond that is more than 3 feet deep might allow fish to survive a winter without a heater but it's not guaranteed. Usually a heater doesn't keep the pond warm , it just maintains a hole for gas exchange.
Still have questions? Get answers by asking now.