The iodine idea hasn't really been proven yet. You should also be adding enough to your tank from the foods you feed . You also really don't need halides for lots of the shrooms ," a number of them will melt into a nice puddle of goop under 6500k trust me
", for a number of them you could use a bulb designed for plants. They are very forgiving and you could have what you want for less than $20. Just keep them in the upper portions of the tank and research your species. I know that this will work for a fact as I've done it in the past.
Hth
Chris
Hth
Chris