my experience dealing with fish spawning... dont even think about messing with them because if they spawned in the first place conditions were decent enough, i wouldnt change anything. i tried to separate off a few batches of convict fry to try to ease their parents agression but out of all the eggs i only got a few to live. but, if i dont do anything i would end up with 60 or 70 little fish swimmin around... and they get eaten by my electric yellows wich is fine with me. i did have about 60 of some 1/4"long babies that i was able to net and isolate, but i wouldnt even bother messing with anything smaller than that. if you really want to breed, you should put your pair in a tank all by themselfs.
what kind of piranhas are they??? can you ship them if your successful? i would buy some from you lol. u would have to label them as pacu or somethin tho bc i doubt customs would let that slide in like that lol.
lol i can just see it now, a felony over a fish tank! haha awesome.