Welcome back.
Looks very good, but it's so small.
"change out everything"? I don't think so.
A Skimmer is not needed but Activated Carbon is a necessity for all reef aquariums. All but one of the two dozen tanks I've had over the years were Skimmerless, as you can see here:
http://utahreefs.com/forum/forum_posts.asp?TID=37523Yes, I'd remove all bioballs now and as time permits, do a rockless Refugium of Chaeto there instead.
I'd add as many Zoanthids and other soft coral as you want anytime now.
Wait at least another month before adding Frogspawn or other stony coral.
Coral filter the water. Fish pollute the water.
The fish list is very reasonable.
Snails are more valuable than hermits in controlling algae. I'd add 5-10 snails in a couple weeks and keep adding as needed. Astrea, Cerith, Nerite, Hawaiian Strombus and Margarita are all good snails and I recommend a variety because they each eat algae a little differently in different places in the tank.
I'd read the WMAS Reefkeeping Tips linked below in my sig line and keep coming back here for more.
"This is the right place" for all your correct (or mostly correct
) information.
Enjoy
Edited by Mark Peterson - June 08 2012 at 10:15pm