collonista snail eating fish

Copperbanded butterfly perhaps.

Anyway, they are nocturnal and the population will decline as a tank ages. My tank is 3 years old and I now have very few.

They are just harmless grazers that eat the film algae.

As long as they are not out during the day, or do not adversely affect the system, personally I would not buy something that will just add to the bio-load.
 
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