Hmm. I have a tank with an Fx5 and it is crystal. also the clarity of the water will change with the different fish you have. For instance Redtails and other largefish create a lot of waste and ammonia which clouds the water. another thing you may want to look into is the biological filter. you need good bacteria to break down the bad bacteria that clouds water. in new tanks the biological filter is not set up yet. try adding stress zyme. that willl help. Also companies make water clarifyer that you can get at most pet stores.