Mushrooms in general are pretty fast growers. Many people I know (myself included) don't do much in the way of anything special for the mushrooms. Are your T-5 lights high output, or normal output? If they are normal output, you will obviouvsly get slower growth. Bear in mind also that some mushrooms do better and proliferate more quickly in slightly shaded regions of the tank. Beyond that, just put 'em in and kick back with a beer.
If you don't want to wait and want to get your hands wet, then I suppose you can try fragging the polyps and try propogating them this way (experiment on one polyp first). All you need to do is cut a wedge of the mushroom off, only the wedge you slice off must go through the mouth of the polyp.