Urgent zoas and palys curling out..

i have a 2yr old reef tank in which the palys and zoas have started to curl out. i dont understand why. i had changed the lighting to led jus 2 weeks back. only the yellow zoa and green plays are curling rest of my zoas and mushrooms are going great. some told me its due to low plankton, some tell its due to low feeding and some say its due to light. im just confused. pics attached......

 

I've heard they just do that sometimes, even with stable conditions and parameters they just melt away. One rock is fine, one next to it withers away.

 

any reason? i just went back to pc lighting from led... what should i do?

 

sounds like they didnt like the change

 

Lower the LED level of cut back the light period and acclimate the corals to the light.

 

i have removed the leds for now. now how should i let them use to the leds?

 

please help.... new to led. the tank size is 15" cube. i bought 1 royal blue flood light and 1 cool white flood light 10w each. the spectrum and par is a bit high.