Irresponseable reef keeping is in perfect order. The fish will grow and need to eat . The load from waste and uneatin food will only get worse and fish will stress from lack of prime realistate.The fact you havent got ick doesnt mean anything but luck.Some fish may have infectuos deseases that may only appear after there very stressed. A 6 month tank is no reason to believe you can do what other dont and shouldnt.
You have a eco sensitive piece of a complex reef system that only within the last 10 yrs or so has been considered a hobby that almost anybody can do but there are ways to do it.
Most if not almost all the fish and coral you have or get would have been taken right from the ocean and we have a responsablity to care for them the best we can. Sounds like you like the hobby alot and seem to really enjoy it.So i would just get another tank and seperate reef safe fish with FO fish or remove FO fish and ungrade to a lrger tank so you could have more stock.
And as for stock seems you just through in a bunch of standered fish and didnt do much research. Well there are many unique fish that are less known about and the fact you have and observe them daily could help with there place in the hobby.
http://www.liveaquaria.com/diversden...3319&subref=AB
So slow down as a reef tank means coral and the fish we add are more for alge , SB controll as well as a little visual affect.