This monster tried to kill my dearest arowana!

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I think that my pleco is attaking my fish at night too. My aro loses scales and my oscar has little nips on his fins
 
Thats either one mean Royal or one hungry as hell Royal. Ive yet to have any troubles between my Plecos an my Aros.
 
i hope your aro is ok, i lost a lot of koi to a common pleco that did that, then i lost a different common pleco to a firemouth that tore off all it's fins, you never know with plecos
 
I've heard that Panque sp. tend to be fairly aggressive when it comes to sucking off fish's slime coat.
 
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