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Ok so tilapia eat algae. That is great to know. How many Tilapia will keep the algae population under control in a 3000 gallon pond which is in full light? reason I ask is I'm looking to get a pond filtration system and manufacturer recommends different systems based on sun light vs shade or more algae vs less.They don't actually eat poop. Poop causes algae to grow rapidly, and the Tilapia eat algae - and other vegetable matter.
I know ducks eat duckweed - my friend's two runner ducks completely cleaned her pond of duckweed in a couple of weeks, and there was a thick layer of it all over the pond when they started. But I haven't seen geese eat it, and I know my breeder regularly has to scoop it out of his goose pond to keep it down. So I'm guessing duckweed would be a better choice than lily pads to keep down evaporation in a goose pond.