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471 Posts
you should actually try not to feed them feeders that much. they arent very good for the piranhas. try to feed them things like white fish fillet, shrimp, squid, smelt, bloodworms...the list goes on. if your going to feed feeders you should quarantine them for a couple of weeks in another clean tank and feed them well. if your completely set on feeding feeders then yes you can put a whole bunch in there and let them eat at there own rate, but there is going to be a clean up of dead fish, and an increased bio load. by the way, welcome to the site