hey, I don't mean to be a killjoy or anything but GET A QT TANK
You will save yourself a TON of heartache in the long run. Get a $30 wallmart special plastic 5 gallon tank, put some sand or gravel from the main tank in there, just enough to coat the bottom of the thing and some water from the main tank. plug it in, and let it run. You might invest in a small powerhead to move the water arround, but you might not need it if the included pump is good enough. You also could buy one small damsel or something and toss it in too, just to keep the bio-load cycling. You need a QT tank. trust me, when you add a powder brown tang to your main system that comes down with ich a week later and wipes out half your 100 gallon setup, you will wish you had a QT tank.