Be patient. Be calm. Let them grow on their own and in time they will be 9" + inches in size and you will wonder where the time went. Piranha or anyother creature for that matter dont grow according to your will. You can certainly help them out with feeding them good nutricious things like beef heart and krill but they will grow dude dont worry about that for sure. I am getting nervous about the size that my P's are getting. I have never kept full grown ones and I dont know if I am ready for this !!!!!!!!!!CoolD said:How do you make piranhas grow faster? Are certain foods better for growth and if so what??
Also by doing water changes more often increase their growth rate?