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Pothos Ivy Filter?



It's my understanding that terrestrial plants are better at removing
phosphates than aquatic plants (which are better at removing nitrates). I
have a setup where it would be easy to dangle the roots of a terrestrial
plant in the sump of a planted tank. I've heard that pothos ivy can be
poisonous to people, so I was wondering if it would be a good candidate as a
phosphate absorbing plant for a tank with fish.  If not, what other plants
might be good?

Tom
Austin, Texas