i've never used a QT tank for new fish, i've lost a few, made a few bad decisions, but now im upgrading to a 110. I now want to setup a QT tank for the fish that i get. How do i setup one of these? Are they connected to the main tank? If not then whats the difference going from the LFS to my tank? What do i need to setup one of these?(tank size, filtration, lighting, powerhead)?