Foggy Water

My tank has a faint smokey/cloudy look to the water. It's been like this since I started. I have zeolite crystals in my sump now because they claim to treat cloudy water but I haven't seen a change in the water clarity. It's not horrible but it is noticeable. Any idea what I can do to get that crystal clear water?



I use RODI water and instant ocean salt. I'm about to switch over to Kent Reef Salt. I have carbon in the sump also.