I tried keeping different types of acros purchased from Texas and California online stores. With the volume the stores I use move, origin is probably diverse.
The corals were dying by way of bleaching, never noticed shedding or otherwise.
Some would be covered by what appeared to be sediment.
Sea Level Aquarium checked the water and testable parameters were dead on.
I cut the dose of vodka late June, bought some more acros and they are still alive in the tank.
The only major change in the tank was cutting back on vodka, nitrates don't get very high but I do have nitrates now, GFO seems to truly keep phosphates in check.
The only significant change I have made was cutting back on vodka and now the tank appears to be consuming Alk and Mag at faster rates than water changes and all in one additives such as Reef Complete can replenish.
I am trying to figure out how to incorporate either a sediment tank or drip tray system to catch waste as its about to enter the sump. The filter socks are not for me, have at least two dozen that got used once and never again, simply a PITA, industry needs to come up with cheaper disposable alternative.
Anyhow, I am not running around losing sleep, as long as the corals are alive and they are I will slowly continue to figure out the least time consuming way to ensure the water has ample nutrients to support growth. For that I already purchased dosing pumps but still have not decided exactly which products to dose.
In conclusion, while I do not avidly committed to ensuring that the corals grow at a specific % daily I do want to ensure their survival.
Slowly but surely...
Considering adding various types of macros I the sump and possibly an algae scrubber to aid with the removal of nitrates the natural way and least expensive way.
In 22yrs reefkeeping, my best advice is maintaining stability. There are alot of ways to keep sps as noted. Regular maintenance is a necessity.
First, what kind of sps/ acros are you obtaining...captive bred,maricultured or wild caught?
There is a big difference. Captive multigenerational corals are ususally better acclimated to our artificial systems.
Second, how are they dying. Lose color, tissue? If tissue loss at base or tips?
Third, how do you acclimate your corals? Do you quarantine? Dip?
There is alot of good advice in this thread
Sig