To me it's all relative..I'm gonna say don't be disheartened when you hear this person say oh I got this growth and this is colouring up like this and that and the next, it does not happen like that...I've seen it first hand from T8 to Led to T5 and MH - it's all bloody slow growing so don't be disheartened at all , if you want fast then get some small clams, get some baby shrimp and get some baby fish be it angels , tangs etc etc.
Hard coral take forever to grow, except for Staghorns... when they grow they grow fast.....this whole reefing game is about patience and time.
Each coral is fighting the next one along side of it with its own chemical warfare - you may not see it but this could be a reason why you not seeing growth, saying that I am quite sure that if you lift any of your coral you would clearly see fresh white new skeleton where growth has occurred...
furthermore I can guarantee growth is happening if your kh is dropping on a daily basis. ;)