Good or Bad Pest

RuttingB

New member
I noticed some pests in the tank. They have hard shells, look like a potato bug. Are they good or bad? 2015-06-24 19.07.10.jpg
 
or if it's not a snail type bug than maybe could be a isopod. some are good some are parasitic. sorry I don't know whata potato bug is.
 

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