I am going to need a larger tank for my young Dovii once he grows. Right now he is only 3' inches and living in a 55 gal tank. I have A 100 gal tank but my large Arrowana is living in there. I know that I am going to need a larger tank soon. I have read that a lot of fishkeepers are building their own tanks. I would like to build my own 200 gal tank to house my male Dovii and his mate in. Where can I get step by step info on building my own tank set up?