I don't like to use chemicals for control of algae. Two different ways I have controlled it over the years. A smaller amount of vegitation and using KOI and israeli carp as in the picture's Below.
When a winter fish kill killed these fish I use more vegetation using Lilly pads, cattails and lots of submerged aquatic plants and in both types of algae control I used grass carp for some control of plants. 18 in the first two pictures and 7 in the second pictures. Most don't like this much vegetation but for me it draws in the wildlife. But the point is the nutrients are used up by the plants and or the right fish and so I don't have algae problems.
