Elongation or black rhom I would say. All depends on what your looking for. If you want big and bulky that gets bigger than 8 inches, then the rhom. But if you want quick and slender that stays smaller than the Elongatus.
Spilo's are very aggressive and awesome. But as said elongs are too but if you go that route get a "black mask" elongatus!
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there's no guarantee that you'll get an aggressive piranha, it all differs from fish to fish and for a 125g tank I wouldn't consider any species to be smaller than 9-10" unless you like looking at an empty tank with only one small fish in it.
if you are just thinking of getting one that would be like in those piranha movies then piranha is probably not the right fish for you.
there's no guarantee that you'll get an aggressive piranha, it all differs from fish to fish and for a 125g tank I wouldn't consider any species to be smaller than 9-10" unless you like looking at an empty tank with only one small fish in it.
if you are just thinking of getting one that would be like in those piranha movies then piranha is probably not the right fish for you.
Wanting solo p. I already have a shoal of rpb feeding on frozen smelt and pellets and you can keep movie crap to yourself I have kept p's for years my current shoal if had for 3 years and I was thinking black mask elongatous or red spilo
Juvenile Serras are notoriously shy and skittish. You may find a rare outgoing one, but you're going to be waiting quite awhile for it to mature and take on its more aggressive nature. That's not even guaranteed. Try and find a Brandti, just about everyone who owns one says they are nasty.
Also don't underestimate the value that good water quality will have on the behavior of your fish.
