I would get in the habit of doing water changes now, they are essential for reducing the DOC that isn't remvoed by skimming and GAC and can promote coral pathogens in the coral microbiomes. I'd suggest you read Aquabiomics article on establishing healthy microbiomes. (FYI, less than 2% of the microbail stuff on reefs can be cultured and stuck in a bottle.)
Studying the effects of live rock in a newly established aquarium shows that high-quality live rock promotes the rapid establishment of an effective biological filter and a microbial community similar to those found in mature reef tanks.
www.reef2reef.com
I'd also recommend Forest ROhwer's book and video, "Coral Reefs in the Microbial Seas" The video compliments Rohwer's book of the same title (Paper back is ~$20, Kindle is ~$10), both deal with the conflicting roles of the different types of DOC in reef ecosystems. While there is overlap bewteen his book and the video both have information not covered by the other and together give a broader view of the complex relationships found in reef ecosystems
Here's some other videos you may find informative:
Changing Seas - Mysterious Microbes
Nitrogen cycling in hte coral holobiont
BActeria and Sponges
Maintenance of Coral Reef Health (refferences at the end)
Optical Feedback Loop in Colorful Coral Bleaching
Richard Ross What's up with phosphate"