Hello.
The first time I make a pond the second year I put 100 Rainbow trout, I give them pellets all the summer, at the Autumn they were big and fat, but in Winter I let the ice cover all the pond with snow, I didn't put aerator and I didn't make a hole in the ice for the gaz to escape.
So in the spring, Surprise all the fish was dead.
After I bought some books and I find Pond Boss.
And you, what is your biggest mistake in your pond
A+
