Cool beans! I know of a few people that have done that. Fortunately, it is one of the easiest goals to achieve, but requires patience (or laziness, lol). Based on the comments, it seems like we are under a different impression, as if you want to reduce or get rid of some of these guys. So my recommendations will differ from others here.
To naturally balance your tank, just do as little as possible. Dont try to control the various species populations. Just keep the temperature and salinity within reasonable limits (depending on any secondary goals). Different organisms will rise to prominance, and some will pass away, but that will balance it as naturally as possible for you. Personally, i still think its good to clean the glass, so you can have a better view of everything as the ecosystem develops. With one of my friends tanks, there was lots of GHA after the first couple years, surrounded by tons of mushrooms and couple toadstool corals, and lots of microfauna and clean up crew. He maintained that one for about 20 years, but that tank has since been taken down. The other friends tanks, i didnt follow the progress.