I have five of them, which do very well. However, they seem very susceptible to any changes. I do not think this behavior you are seeing is ‘normal’ or desired, but it might just be an adjustment phase for this new addition, so I would give it a couple of weeks until it gets used to your flow and light, etc.
I also do not use reef roids (phosphate) or aminos (dinos), but I add other coral food (captiv8).
Also, I believe gonies benefit a lot from proper major and minor trace elements, specifically but not only manganese.
Again, yours seems new, so I would continue to observe it without moving it or making other changes.