Drew,
I have not seen one but from the look, it is a mechanical/chemical filter meant to clear up the tank fast. The hang-on feature is neat but provided you do not mind seeing it right next to the tank. It is not a common item here and therefore may be expensive (here).
If your intend is to do the abovementioned, a normal filter will do, just stuff the filter with fine media like fine foam or floss. Just a suggestion.








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