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i've been using blue pond tint lately just to control the algae in my pond. the stuff works pretty good, the fish seem to be a lot more active also, since the water is more clear. i'm not sure if i'm just imagining that, or if they really do like it better. it also makes the waterfall look cool, having blue water flowing from it =]
it does stain the rocks for a little bit, but once the tint is gone, the rocks eventually lose the color.
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