Hate to link to Facebook but can’t get the direct link. Check this guy out.
i don't have FB so thanks for sharing this....dang that video is too short. is that the only vid he posted? that looks like a 20 incher huh? this is what i have been saying since before...give the manueli a really big tank and it will patrol the whole tank endlessly and it'll get very aggressive as well. it is probably the most active serrasalmus specie out there given a very huge home.
Only video that was posted. I doubt it’s 20in but probably up there. Probably imported large and grown some.