The picture is to get an impression of you tank setup and the inhabitants . Sometimes seeing pictures can clarify things you can't describe in 1000 words.
Place picture of some key components.
How often do you do WC and what water parameters do you measure?
I'm not on any water change schedule. I change out a couple gallons (I mix 2 gallons) here and there. I use a racking cane from my old home brewing equipment. I siphon off my rocks or suck up any cyano off the sand bed when I do them. Occasionally I'll vacuum the sand bed, the last time I did the sand bed I let the water decant and then I placed the water back into the tank leaving the sediment behind in the bucket. At that time I place a couple gallons of fresh salt water in to allow me to leave much more water behind in the bucket. I siphoned out about 8 gallons worth and let it stand for about 45 mins before placing it back into the tank.
I measure Nitrates, Phosphates, and I tried to measure Iron.
Nitrates- I always measure between 10 and 25 on Salifert. The color is not quite 10 nor is it quite 25.
Phosphates- Always test zero on my Hanna checker. (713 model)
Iron- Always tests zero on my Hanna checker. I got this test after reading your first thread, only to find out that the level of iron in NSW is way to low for any test kit to detect. I know your run a much higher level in your tank but I've not felt comfortable dosing that much iron into my tank. Especially with no delectable Phosphate in my tank. I know its there, but it's low. I do have some red hair algae on my snails shells.
Here is my tank. It's not really this blue. I have a crappy camera and no photo skills. The MJ1200 in the upper right hand corner is where I run filter floss "when" I run it like in this pic. I only run it 24 hrs and then I either change it or remove it. I only run it when I feel like polishing the water.
This is my false sump. It's 4" PVC. I have a MJ1200 in the bottom for turnover through it. As well as my skimmer intake so my skimmer gets surface water. I extended the skimmer intake to go as close to the bottom as I could with the MJ1200 in there. My ATO is also in the PVC so my salinity doesn't bounce. This pipe acts as the last (return) chamber in a normal sump setup. All evap is seen in this pipe so I loose just a couple ounces to evap before my ATO kicks in. It actually gives me more stability in salinity then standard sumps due to water volume.
My skimmer with 24 hrs of collection. The skimmer is a Reef Octo BH-1000
I also dose a mix of vinegar and vitamin C. I'm dosing about 28ml a day.
I make a concoction of Phyto, R.O.E, Reef Pearls, Mysis, Cyclopeez, and Spirulina Brine. I feed 6ml of this to the tank every day. I'd be happy to feed more once I figure out what's keeping my nitrates up. I could just change tons of water or, I could find a better way to lower them.
The phyto and the R.O.E are by Reef Nutrition
The Reef Pearls is by Brine Shrimp Direct
The Cyclopeeze is by Argent
The frozen Mysis and Spirulina Brine are by Hikari
Edit;
For flow. I have,
2 MJ-1200 295 GPH
2 Aqua top 300 GPH power heads hidden behind the rock work.
1 MP-10 set on reef crest mode at half power
Hope this helps. Super basic setup.