Hey gang, I'm not telling you that you should not keep shrooms in your aquarium. As I always tell people, try to plan where you want to go with your tank in 3 to 5 years. Learn from my mistakes. I did not do this and thankfully it did not turn out too bad. Aside from the runaway stars-- which are easy to keep in check-- and the shrooms (which are not) I have been fortunate. Hence the recommendation that you set up a tank for shrooms and other softies and keep it that way so that you don't wind up with a mostly sps tank that you have to constantly weed out stuff that grows fast and kills your sps if you don't weed them out.
Every tank is different and every reefer has a different vision of what his tank will be. If shrooms fit in with that then good! They are hardy, pretty, and cool to look at. However, when you put them in thinking that they are pretty and hard to kill without a clear vision of where your tank is going-- the very reasons you liked them in the first place could turn out to be the reasons they become a problem in the future when your tank turns a corner into something else.
In addition, having a plan helps you avoid revamping your tank constantly to accomodate the latest fad. I'm not a fan of fad reefing. In order to grow a stable, mature reef you have to work toward a goal. So I'm not harshing on mushrooms and those who love them. Just be careful and make sure that is what you want in the long run. That's all I'm saying.
Like I said, learn from my screw ups. If you plan to eventually end up with an sps or LPS tank, be careful what you put in now that you might wish you didn't later.
Same thing with lighting. If you go with a VHO or CF setup thinking that you will replace it with halide at some point, you will never be happy with your CF/VHOs and at some time will wish you had just saved up the money and went with MH in the first place. Buy your lighting according to where you want to be in a couple years-- not what you can get by with now... another of my mistakes. That is why in my latest lighting upgrade I just went balzout and packed 900 MH watts over my 75 gallon reef. I will never have to upgrade lighting again. If I had done this in the first place I would have saved 100s of $$$.