If (when) the tinfoil pass away i'll examine it closer. Aros have small needle like teeth so maybe i'm just not seeing wounds. Not gonna lie i'm both sad for the fish and excited to have such a predator ?. I still have 2 tinfoils in there because of lack of space and 3 algae eater that are too fast for my net. I'll try to scoop them up during the next water change if the managed to survive. Gotta go faster on the pond project