Macro in Tulamben
There are many 'hidden' dive sites in Tulamben. Of course, most people know the location of its famous wreck site. The liberty wreck has many many visitors on a daily base.
But as I said, there are many little side roads that lead towards small parking lots. Usually not more than a concrete tub for your camera to soak in afterward and a leaky shower.
These sites are very sandy with the occasional pile of rocks. Now around these areas is where you start to look. Sometimes around 10 meters in depth, sometimes much deeper around the 30 meters mark. Nitrox is often used in order to look at as many different deep spots for nudibranchs that don't live shallow.