. Wet/Dry filter, RedSea Protein Skimmer deluxe, 2 powerheads 800, 3 moonlights, 260watt Power Compact Lighting, 50lbs. live rock with 25lbs. coming soon, 4in deep sand bed live sand with crushed coral and fine live sand. I have feather duster, bubble anemone, frog toadstool anemone, sun polyps, few other types of polyps. Maxima Clam, firefish.
I noticed this very light color film on the left side of the tank about 6in worth from the side of the tank to the beginning of the protein skimmer. What can this be? Water levels are fine, Tank has been set up for 3 years.