If I may: for yellow diodogorgia - if you wish - you may try move it farther and upflow from palithoa and zoas (just in case), check if the flow slightly bents tentacles, bast red cyano or any other accumulations from the surface, feed more, maybe even target feeding. Mine revived once after using possibly erithromicine based UltraLife Red Slime Remover. And on the middle branch on photo there is tissue recession, that skeleton is visible. I would cut this branch approximately 2 cm/ 1" below the like where the soft tissue starts. No additional treatment or disinfection. Photos of what may going on now inside this branch are here.