Randy Holmes-Farley
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My Tank Thread
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Algaefix says to keep it away from freshwater snails, shrimp etc. And if it's the same stuff, well probably a good idea to avoid those. No idea if being in a marine setting has any reduction in toxicity. I suppose if things are eating the poisoned organisms, all bets are off.
Edit - considering the algaecide attaches to algae, would this not be considered as concentrated?
I would expect a reduction is effectiveness in saltier water. It interacts with membranes and tissues by ionic charge, and high concentrations of other ions will interfere with that interaction.