Blueberry gorgonians are not photosynthetic. They will need daily feedings to thrive. This can be accomplished by proving a steady supply of phyto in the tank or spot feeding daily. They do like baby brine and they also like reef candy. Reef candy can raise phosphates, but not as much as reef roids.
My BB gorg is now over a year old in my tank and has a ton of phyto available, as I dose it all day long. Whn it was in the coral QT tank, I used a small rectangular container with a hole drilled intothe top, placed it over the gorg and injected a little phyto/baby brine, and reef candy mix into the container. This keeps it localized and you can see when the gorg consumes the majority of it.
It is one my favorite corals, but they do require some demanding care if you cannot keep phyto and other food in the water column for them.
Here is mine.