Do you have a lot of water movement in the tank? If not, they may be staying at the top of the tank for oxygen and you should get a couple of powerheads in the lower areas of the tank.
Also, do you have places for them to hide? Sometimes they will crowd together in a barren tank.
Thanks, I have 2-Hydor Koralia Evolution Powerhead 1050 gph, one on each end of the tank, is this too much or not? I place them at middle of the tank height. As for place for them to hide, I only have dry rocks. I was thinking of Anemone but my tank is not ready for anemone or coral, I just set it up for 2 months. I want to wait for a years to get the water stable before I can add anemone or coral.