It's getting that time that i need to get my baby's into a new home within the yr. I have been doing a lot of research but still get very confused on some of the aspects of building a tank. I am going between the small pool idea with rubbermaid tub for sump. And the plywood. The pool seems the best and most cost affective due to the fact my husdband is not the best at carpentry. So if you diy guys can help me with the pros and cons of both so i can make my decision and get started. Oh the sharks are 2 brown bamded bamboo's and 2 coral cats. right now they are housed in a 180. the largest of the four is at 19 inch and growing fast. A couple of my other lg fish will prob go in there as well....By the way if anyone is unaware this is a saltwater tank build. I knew i was going to have to build a tank when i got them. I am prepared to do so i just need help from you guys to make final decisions.