[Jyetman]

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?