I dont have a lot of advise, my shrooms for the most part do just fine on there own, but I do dose a couple drops of iodine into the tank once a week, but no more, since i havnt gotten around to getting an iodine test kit, i dont want to overdose them.
Heres a couple shots, this first one is of my ugliest (ugly to me anyway) shrooms, and as you can see, one of them doesnt look right, but keeps hanging in there so I leave it alone
And one of my prettier shrooms:
Prettier shrooms
Sorry, had to link them as I've not set it up for my site at iphotohost to allow hotlinking of images to saltwaterfish.com yet.
Uglier Shroom
My shrooms do equally well whether they are placed up high in the tank or on the bottom. The brown ones are down at the bottom of the tank and the bluish green ones are at the top of the tank, and this is with simple lighting, 55w 10k light, 65w 03 actinic light, 27w 6800k