How many tadpoles?

[Gregpond]

I have a 50 gallon pond with 6 small goldfish and am looking for a cleanup crew and am thinking about getting some tadpoles to clean up all the algae that is in the pond. Any idea on how many I should get?

 

[Angel]

Algae is food.... but you can try trapdoor snails. But they be escarco for the fish. For the snails you need to figure out square footage.