Water clarity

I am having a hard time getting my water crystal clear. No matter what I do I always have "floaties" in the tank. I have tried changing the filters in the HOB power filter more often, tried water changes more often, etc. Any suggestions are appreciated.

55 gal tank
HOB power filter
HOB EShopps skimmer
Duncan coral
small zoa colony
fu manchu lion
valentini puffer
blue linckia starfish