As far as medications and qt...I think you need to evaluate the hardiness and health of each fish. Those can be hard on the fish as well. Some fish don't tolerate it as well as others. Steve Pro has an expert forum here on CR, I have heard him give some real good talks on this topic. If you have specific questions, you might want to ask him in his forum. (Not that he can't answer here, but is more apt to see and respond there.)

I need the measurements from the inside of the rim (assuming you want the the frame to sit inside of the rimstock). I can't recall what tank you have off the top of my head. If it is anything with an odd shape, I will need a trace of the shape....then we'll need to know the width of the rimstock so that the frame will sit inside it. You can shoot me a PM when you are ready.