Welcome to Pond Boss.
Your water sample looks like a healthy amount of algae to me.
There is a simple method of tracking your water clarity using a secchi disk.
Using a Secchi DiskYou don't need to do it on an expensive tape measure. Just use a thin rope if you have deeper transparency. Maybe put it on a marked piece of 3/4" PVC pipe if it disappears fairly shallow. (Whichever method gives you greater ease of use.)
If you measure your secchi depth at the same time of day, you should be able to easily track the changes in your pond.
Healthy FERTILE ponds usually have your green water this time of year.
Has all of your added colorant disappeared by now? Many of those create dark tints.
Your biggest fertilizer source may actually be the 12 ducks. They are pooping machines! Evicting the ducks would likely give you clearer water - but I suspect you don't want to do that.
Do any oak leaves make it into your pond? That is the most common source of brown/black tinted water due to tannins.
There are actually some species of brown algae. Perhaps they are present with your green algae at certain times of the year?
Congrats on your beautiful pond!
P.S. I suspect at least one of the "models" in your second pond picture greatly enjoys swimming in the pond.
