I very reluctantly had to bring my silver shark to my LFS recently to find it a better home in larger tank after having it for just over 5 years. I got it from my dad who had it in a much smaller tank. Must have only been about 2- 3 inches. I could see a big change after a few months. Just kept growing and growing but still decided to keep it. Got to the point it took over my tank and the few other fish I had in tank spent most of their time keeping out of its way. Was never aggressive towards any of them though. Bit of a gentle giant !! It got to almost 9 inches! Was absolutely stunning fish. Was very sad to have to remove it but wanted to re-stock my new tank with other fish and it just did not seem fair to keep it in my 3foot tank any longer. Enjoy your silver shark...