i have a 250 gallon mini pond in the backyard, and it is under 3 trees. all the leaves blow in it, and it gets nasty reallllly quick. how can i fix this? are there any fish that would eat the leaves? i live in wisconsin so the pond only is up in the summer. if it were a tropical fish (say a pleco) i could keep it indoors in the winters. but is there any like substance that i can put into the pond? because the tannins from the leaves stain it real quick....

