I have have a 5in Red Belly Pacu and a 9in Silver Arow. They are in a 180gal aquarium. I've had them for about 2 weeks, I feed them Hikari Sticks, Dried Krill, Blood Worms, and Guppies. They dont accept pellets some reason. How long would I have to wait before the Pacu gets to at least 9inches? and the Arow. to be at least a foot? I feed them 3 times a day.