Ok im looking into getting a silver arowana for my 60 gallon tank. Now before you tell me that it is to small im getting a 300 gallon rubbermaid conatainer for him and my rays. Im looking into getting one in the 1"-4''in range how long will it take him to get into the 8" range. Prbly feeding him pelets, krill, bloodworms, and a goldfish like once a month tanks