My grandmother has two homemade ponds in her yard with no heater and coi that breed like crazy it amazes me the water will be froze on top and I think no way them fish are still alive and in the spring she has to give away the little ones and there only maybe 70gal at most
Well... we would never recommend that you put koi in a 70 gallon pond - but maybe grandma has some secret she'd like to share! How many koi are we talking about?