So "dirty" water.. care to elaborate?
My nutrients and most SPS keepers are in the 10 to 20ppm nitrates, and 0.1 to 0.2 phosphates. Suppose thats whats considered "dirty" these days. My tank is SPS dominate with about 4 LPS and 50 or so SPS colonies, not frags. Everything is at optimal color, and growing like crazy(I go through a gallon of 2 part every other week in my 80G cube)
What softies need to thrive, all corals need to thrive. Nutrients or "dirty" water is in fact not "dirty" at all, but just about right. This idea of dirty water came about many years ago when people were trying to emulate the ocean values, and most failed. Yes ULNS can work, but it's such a razors edge, a nudge in either direction causes catastrophic death. Kind fo the reasons many years ago SPS wrre considered so hard to keep. Many years later, many research papers later, we now know better.
Now if everyone stopped watching youtube reefers who are in and out the hobby quicker then some people change their underwear, they would know those low levels they suggest are nearly impossible to maintain, and are a fools errand as ALL corals love nutrients, not just softies. There is no such thing as "dirty" water, unless it truly is dirty(can't see through it).
Stop paying attention to the newbies in the hobby, and find someone whos been doing it for several years(longer then 5) and try to emulate their procedures, and practices.
The general consensus is the proof is in the pudding. While I agree with that, I do not need to post pictures to prop myself up. Just go look through my build thread for pictures of my tank. Yes it hasn't been updated in months(it's not really a build thread anymore as the tank is going on 10 years old), but I do update it from time to time.