Are you feeding the individual polyps? What is your nutrient range... I.E. Nitrate, phosphate reading...
I see that you have SPS in your tank as well. Are your SPS paling or darkening, or are just right?
Have any algae anywhere in the system? What are you feeding? Typically, soft corals like nitrate and a little phosphate in the water column... paling color might mean not enough available nutrients... OR a fluctuation in temp/salinity.
Start doing some full parameter checks if you can using a decent quality test kit to get a better idea of what is going on. If your not feeding them right now, then start doing so... Turkey baster with cyclops, enriched baby brine, mysis or something similar that is small... blow it at it gently and let the polyps catch it. They should darken in color a bit with some more nutrients in the water column... and if your light is too strong, you may need to move them down in the tank.