there is one thing i forgot to mention and i figured i should bring it up as there are several other reefers that are joinging me in macro algae. bayer advanced can be taken up by plants ( i am unsure of how it is taken up, wether by the roots and can permeate through the leaves etc.) and in simple environmental science terms its what we call a persistant pesticide, as it doesnt breakdown quickly and remains effective for some time. i have never used this dip on a plant im not even sure if it would work. but if the plant does survive ( i would assume it would as its designed tobe safe for plants) i would not feed it to a fish as many of us commonly do when a palatable macro becomes too large.