well..piranhas are pretty fast growers.they can get up to 15+ inches in length.they will keep the red.as they mature,their body gets darker until it is almost black with a purplish hue and gold and silver flecks almost like a metalflake paint job.about 2 1/2 months ago my daughters friend ask me to watch his for a couple of weeks till he moved.at that time they wer less than 2 inches long.so i put them in a 20 long and fed them Plecocaine.they are now over 4 inches long..i think he is going to have to pay me to get them back..but he had better hurry because i need the tank space.
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if we ignore nature;maybe it will go away
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