Having a green water algae problem for the first time in 10 years. I have a 1500 gal pond with 3 filters. 1200 gph pump to UV to Skippy filter to waterfall. A 4200gph pump to a filter-falls, and a pondmaster 2000 filter in the pond with a 500 gph pump. The bottom is clean of leaves and dirt. One quarter covered with waterlilies and a good amount of water hyacinths. I have 6 large koi and 4 goldfish. The pond has always been clear with the 9 watt Cyprio UV. Since it went green, I added a 18 watt turbo twist UV ahead of the 9W. Both have new bulbs. Running with the 2 UV clarifiers for 6 days now and it actually might be getting a little worse. One foot down the fish look hazy. Two feet down they are very hazy. Read up on the subject again but did not find anything new. Also cut down feeding from the usual twice a day to once a day at least 3 weeks ago. Any suggestions?