Not sure what's going on help
 

For over a week now all my candy canes have stopped extending their feeding tentacles at night is this normal behavior? They expand normally during the day and seem fine. I also notice some zoas have closed and I've checked no predators after dips. Is something going on with my water? The only thing I've done differently is increased water changes, changed both RO filters and switched over to seachem matrix carbon. I have lots of cheato could this be stripping to much nutrients from water? All test show normal including phosphates and nitrates both read zero - Alk at 10, ph at 8.2 normal. Tank is four years old, using red sea coral pro salt, salinity at 1.025, maxspect razor LED 160 Watts and no dosing. One thing I don't do is vacuum the sand bed was told a four inch depth undisturbed is beneficial? Not sure what to do now?

Do corals adjust/acclimate to the water conditions so can carbon shock the system if the water was dirtier then usual or being more aggressive at removing soft coral toxins?

Why don't you post this in LPS forum? Not really a chemistry issue.

The carbon might in theory be reducing the level of organic chemicals in the water column, which might reduce the feeding response. If that's the case, the corals should be fine. You could try spot-feeding the corals, to see whether they respond.

Those water parameters are all fine.