If it doesn't glow at night when you stir it your looking at sewage.
Not all algae and plankton glow. The bioluminescence algae we get here is normally a red/copper color and that’s why we call it red tide.
Green water is nutrient rich water. Lots of little organisms growing and feeding there.
The clear blue water is mostly void of nutrients that’s why we look for temp breaks which usually coincide with chloro breaks and you find fish.
As you can see below, Long Beach is high in nutrients and chlorophyll. I’d expect that water to have about 2ft of vis and be anything from green to brown.
Catalina looks like it has nice green water and probably 10ft or so of vis. And then down south La Jolla is semi sheltered so it’s showing lighter green water surrounded by the dark green/brown water. Perfect for yellowtail and why they like to congregate there most of the winter.