Blue legs, or preferably scarlet-legged hermits can help a lot, but not really enough unless you have a simply ridiculous number of them.
The brown algae is just one of those things that new tanks have to endure. It will eventually go away, but it will help if you physically remove it regularly until it finally runs out of food and stops growing. Take steps to spur on your coralline growth and the coralline will help you get rid of the brown diatoms.
Sediment covering is called siltation on the reef, and it is deadly. Get rid of it.
There are numerous places where you can buy invert packages for certain sizes of tanks, and none of them seem to agree on what such packages should include. Personally, I like the packages from
www.reeftopia.com &
www.tampabaysaltwater.com . Tampa bay's stuff is more function-oriented, while reeftopia's is more of a blend of function and beauty.
What kind of rock did you get? From where did you get it? More to the point, why do you think it needs cycling?