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Could be. Do you have a skimmer? I see the veggie clip there- do you put a lot of algae sheets in tank for tang? Could be that breaking up, floating around and disintegrating in water.
A green tint in the water is usually from an algae bloom. It's usually caused by excessive nutrients in the water. How often do you do water changes and how big are they? What kind of water do you use? Tap, well, RO/DI, etc? What are your water parameters, especially nitrate and phosphate?
I do have a skimmer. I put 1/4 of the rectangular veggie sheets in the clip every day. I use tap water and change 5 gallons of the 125 gallon tank each week. I'll test the parameters and get back to you.