I just walk up to the tank and shoot them when they get over hard ground.
Dave
That was the only way we duck hunted when I was a kid. We have two big stock tanks and a big creek on the old home place Ranch.
And we knew every farmer & rancher for miles around who would let us jump shoot their tanks too. We killed the crap out of them.
I just bought a new Remington Turkey / Duck gun in 12 ga that's Camo with a 21" rem choke barrel the other day. Plan to take a couple of the nephews to do some duck hunting this season. It will be the first time in almost 10 years for me.