It's just a combination of lots of seeding with live rock, live sand, and water from existing set-ups.
I always get small phos spikes at the end. And honestly i'm sure if I was checking params every day 3 times a day I'd catch a nitrite or nitrate boost as well, but I never seem to. I just test once a day or every other day and then add the GFO once i see it.
But I recently did something where I put all my Live Rock and Live Sand in the tank and filled it with Fresh RODI water, and let it run for 3 days. I killed off a bunch of inverts and things on the live rock, but from everything i've studied 75% of BB survives Saltwater to Freshwater.
But I wanted to try this out as I wasn't sure of the LR source point.... funny almost all the feather duster worms on the LR survived..... so idk....
I then cleaned out the tank and sump from any big remaining particles i could see, and detritus or dead bodies from worms.
I then raised the salinity up to 1.026 over 4-5 days. then I added a 2 oz bottle of Dr. Tims.
I saw no ammonia or nitrate or nitrite, but after 3 days I saw a big phosphate spike, (it was coupled with Dino's and Cyano) I have GFO always on hand, and it balanced it out in a couple hours,
Dino's died after I added corals shortly after that, and then Cyano slowly fading with time.
It's hard to say exactly what caused it though, the tank was also sitting in a room by the sun for 2 days before I realized that was happening....
anyway, a lot of interesting things with that tank but It's starting to shape up. It's about 3 weeks old now.
excuse the right corner.
the scape is still under construction.