I got one of those to take care of my flat worms. Did a great job, but they are only good to eradicate most not all flatworms when you have thousands.
I still have a few left and my Headshield is long gone, but my Coris wrasse is finishing off what is left.
If you don't have too many just get a Wrasse to take care of them.
I read that usually they stay in populations of only a few, but can multiply to problem prepositions if conditions are right for them.
So having some is not really a problem as long as they are the none acro eating type.
I try to stay away from any chemicals as I believe that it is not as selective as just killing off what is says on the box.
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