Looking good, glad to have helped with the salt selection
You should periodically test for po3 no3 as you want some in there as you don't want to starve the coral in a ULNS system
I think target po4 is 0.05 and no3@ .2
I'm a bit stuck.with my zeo as my nitrates are 0 and phosphates are .08 and in order to.drop po I have to raise nitrates a bit, so always good to check.