posted 10 years ago
That is a decent size pond and it's pretty deep. Deeper than an average koi pond... And considering I don't think the ducks will spend ALL of their time in it, and they will eventually go off to find a bigger pond and other ducks... It may be ok. Do you have a filter? I run a sand pool filter with my pond a couple hours a day during the season to help with all the fish and frog muck.
Back to the lilies... Again I'm not a "duck guy" but I don't think they would eat the leaves or flowers, I would be more afraid of them uprooting the rhizomes and eating the roots.