questions: regarding control of algal bloom. 
 answers: immediately stop the application of feed and fertilizers, manually (netting, siphoning), liming- 160 kg/bigha/year (5-6 ph), 133 kg/bigha/year (6-6.5 ph), 55kg/bigha/year (6.5-7.5 ph). if possible change the water @ 30% or give aeration using aerators. 
*if there is no provision for replenishing the water or there is no chance for artificial aeration and if the water level is above 1m.