in my opinion you just lift out a rock and smell test it, if nothing obvious you move on and just reef and enjoy the high quality nature of the live rock, ID'ing things you hitchhiked in (saw your macros forum thread is all good fun to discover)
you are getting zero biological impact indication for the most dangerous naturally produced compound in your tank
it is ok to add bac dosers, or prime, but prime is one of the test adulterants too so that's why it was worth the time to start considering when to doubt a test kit and trust biology instead
you can tell by my line of questioning here, I was reinforcing this thread below. look how many key terms apply directly to your tank here, we even have pictures of two tanks 100% exactly like yours minus the dry sand start. we like detailing the true nature of ammonia in a reef tank.
http://reef2reef.com/threads/new-ta...d-cocktail-shrimp-live-rock-no-shrimp.214618/
the fish you added will not drive your system to 1 ppm, after a true ammonia zero verification post tank addition to me that started the mystery
if they did, your system would smell, the fanworms would close, the fish would pant sideways, and the water would go cloudy.
If something is pumping ammonia to the degree stated and the measure is accurate, it's a dying organism not the current live bioloading shown imo. Agreed that early spikes weeks ago could have been from light curing in the new tank but it wasn't very pronounced... everything survived and even true 1_ ppm sustained for a week would kill and cause the loss cascade.