The members there had reported that it would semi- or permantly damage finnage; anything from curling fins to making them ragged and so forth. It was especially seen on VTs with especially long fins, HMs, SDs, and CTs.
There was something else that Melafix was doing to the bettas, but I can't for the life of me remember what it was. I'll go do a search.
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Eheim Pimpette #230
Google is the remedy for stupidity.
It's not the size of the tank, but how you use it. 
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