That is a hot or loaded question..With the organisms that you have you should be alright,depending on where they are placed,But what you should consider is what do you want in the future,..If you are going to keep beginner corals or polyps they are more forgiving than others,and can adapt more easily than others to lower light levels..some will say change out to higher watt metal halides,which if you are you could keep more light loving corals,,and they would be right, the light would penetrate the water deeper down in the tank and you could have more variety of corals,but you have to remember that the heat of the bulbs if not vented away from the tank could raise the temperature of the water and hurt what you are trying to keep,which would mean using a chiller..which would be more money or expence,Now you have to remember that you are going to have to change your bulbs out at regular intervals,to keep up the proper intencity and spectral output of the bulbs..What a lot of people will say is bang for the buck ,They would use LEDs,reason being they last longer ,don`t use as much electricity,their light penetrates the depth of the aquarium easier,they run a lot cooler..and there are a few more reasons........What it boils down to is What are you going to have,And what in the long run are you willing to spend.....Does that make since