I got my RTC with 8 cm. After 3 months, it already reach 20 cm...In the beginning I used to feed it with Guppyes, then, It start growing, so I gave Carps, and TODAY, I woke up, down the stairs to see my aqua..My ARO was in the ground (dead) and my Oscar was in the belly of the RTC...(Oscar - 9 cm / ARO - 18 cm). =(