Pond Doing Great, 4 new fantails

Algae bloom came about three weeks ago. Cleaned the filter media bags and rinsed out filters two weeks ago and pond is clear, very little green in the water. The pond is about as clear as its ever been. Lilies and lotus cover only 15-20% of surface. No chemical treatment needed so far. Added the 4 fantails from my classroom yesterday. All OK so far. Cold yesterday (45) and today (55).