That looks like a heavy plankton bloom. Do I see a bunch of FA ? If so and you put in a CU product then be ready for a DO problem . Rake out some of the FA if possible. Aeration should help reduce the problem . Harvest some CC , LMB up to 20% of your total - my guess is 10 lbs total - max. A few BG also. That is if you are fish (bio-mass) heavy.