I know I will need bigger tank for the gar and the id sharks, i am looking into gettting hopefully a 125 gallon within the next few weeks, the columbians I heard need brackish tank when they get bigger I already have a 55 gallon for them when they get bigger, this tank is basically my first predator tank, and my first try at aquascaping. I want your ideas for when I setup my 55 for the columbians, and the 125 for the gar fish on how you think the natural look of this tank is, so I can start to setup and cycle the 55 and so on. thank you for your ideas and quick reply, there is a lot of information on this website to help me out. But I also like constructive criticism for the members so i do everything right in the next tanks. i will be posting pictures within the next day or so of the gar fish. Thanks again for all your information you have given me.