I believe a lot of the coloration is from the alkalinity of the water. Lots of lime in the soil. Since this is 7 feet down looking through another 6-7 feet to the bottom, we are looking through a lot of water. The perch are likely 4-6 feet from the camera. I think the camera has a high level of color saturation as well making it look a lot more green than it really is. Visually it just looks plain clear.

If I pull water from the pond into a container, it is as clear as tap water with very few gizmos swimming about.

I really wish I had a live feed on the camera so I could see what the heck was going on. It took a lot of tries to get a decent rig set up to see this. I cannot transmit WiFi through 7 feet of water.