I am building a small pond for our Muscovy with a drain to a hose to change out the water every few days. We live in Mosquito Heaven. I know Muscovies eat mosquitos, but doubt he will eat enough? Do I need to use Mosquito Dunks in the pond? These are a natural bacteria that do not harm ducks, but I still don't want him knawing on it. The pond will be in the shade this time of year because it is a black concrete mixng pan that heats up the waer quickly if in the sun.