My water clarity looks the same as yours and that's what lots of plants can do. Bering in mind that there are chemicals made for water use, but these are experiences of mine and pond friends of mine killing cattails. Two farmer pond friends use Roundup to kill cattails with no fish kills they were aware of. In the middle of last summer I used a the small bottle of Eliminator (about 16 oz $10 Walmart) mixing the whole bottle with 2 1/2 gal., or 4 oz. to a gal. to kill a cattail area of about 10 x 30 feet and not one cattail has come up in this area so far. I had bubbles from the spray form on the top of the water that my minnows were gulping at like trying to eat so I closely watched for dead minnows the next couple of weeks and didn't see any. I use about a gallon of the spray for this area and the rest on my driveway. I don't recommend this.
I also had nasty Eurasian Millfoil in my one acre pond in which I added 18 grass carp and in 4 years the pond was almost nude of any plants.
