Well, we need a few more details to help you with that... How big is the tank? What is your water quality like? How big are your loaches? Do you have adequate cover in your tank for both the loaches and other species?
I have never had a problem with aggresive clown loaches, and mine did just fine with some cichlids. Maybe you could add some African cichlids like Brichardi, or Julidochromis. There are plenty of different types of cichlids with bluish hues.