Thats a good pen! Mine is 20×70 basically.But after seeing thephantoms I have to add a new pen this year! I had to build the last pond above ground because the kept digging under the liner and filling it with mud.
Yeah i don't live in town.All my ducks ponds are smaller.Right now all of them are only using 1.Its 20×10.Its in a hoop coop style pen so i could make it like a green house for the sensitive ducks.