Some SPS not doing well

[Dr. Jim]

I have the same IM 200 EXT as yours. I have 10 XR15's over it (set at "AB Program" at 80%). I'm not sure if all of those are necessary but I'm fairly confident that 3 aren't enough (unless, perhaps, you have the SPS directly under each light).
(My system is a temporary holding system while I am renting and looking for a new home where I will build a larger custom tank. This is why all my corals are on eggcrate for now ).

 

[kratosxxl]

I have the same IM 200 EXT as yours. I have 10 XR15's over it (set at "AB Program" at 80%). I'm not sure if all of those are necessary but I'm fairly confident that 3 aren't enough (unless, perhaps, you have the SPS directly under each light).
(My system is a temporary holding system while I am renting and looking for a new home where I will build a larger custom tank. This is why all my corals are on eggcrate for now ).

yeah i actually have Island in the middle right under leds.:)

 

[ReneReef]

I just dont think now its the rigfht time to bump up the par right ? i can get 600 on that top rock and 250 on the sand , but considering all things going would increasing par hurt even more ?

PAR numbers are hardly reliable. Just rough ball park figures. You might be getting these numbers directly under the light. But your lights simply cannot be giving the proper intensity throughout your tank. Just waaaayyyyy too little.

At the moment, the lack of light is killing your acros. Or at least greatly contributing to their death.
Doing nothing about your lights, you might as well toss them in the bin right now.

 

[mcarroll]

I just dont think now its the rigfht time to bump up the par right ? i can get 600 on that top rock and 250 on the sand , but considering all things going would increasing par hurt even more ?

This is a pretty typical photosynthetic scenario, even for many acro species:

from: https://orphek.com/the-myth-of-corals-requiring-unlimited-amounts-of-light/

This is a very complimentary piece...note Table 1 at the very bottom of the article:
https://reefs.com/magazine/how-much...allow-water-invertebrates-light-requirements/

There really aren't that many corals that "require" (ie their saturation point) very strong light. The ones that have a saturation point that fits a higher range, it's still more true that they tolerate it than they need it. Also note the final two pics which have their Figure numbering off by two in the text for some reason.

If your current PAR levels are at least satisfying the corals compensation points (see Table 1) then it's not doing them any harm. IMO use whatever acclimation plan you had to bring the lights up to their final level....but don't systemically put that off.