Dan, in the article I wrote, it has a sidebar that shows you how to calculate the dose. Not having a quarantine system can complicate it, since there might be flatworms left behind (or eggs). I would just take the colonies out, dip them, vigourously shake them and then return them to the tank. I would dip one or two intially to confirm that you are indeed dealing w/ Acro flatworms.
Mitch
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