Fish is easy also need to depend on the fish you keep. Fish and coral all has different type of level. Keep easy fish and LPS like zoas, mushroom & leather.
You don't really need to dose iron if you water change using salt mix. Brand like DD H20, Tropic Marin, Red sea Pro etc. Like what james say it maybe bleach your monti and acan. Due to placing of your coral too high.
Where is GC? Amino acid if over dose will increase in po4 and cause algae problem best under dose for part B. So far I use my sps very healthy and even light on time poly extension is good
If u got more sps then normal normally KH consume is around 2 per day unless you using CA or dosing pump to maintain. SPS is very sensitive to KH. Low KH can cause STN and high KH can cause sps to bleach.