questions: asking about green algal bloom in fish and other fertilizer dose 
 answers: suggestion 
first use mosquito net to remove thick algal bloom 
next prepare 5 to 6 bundle of dry paddy straw and let it float on the water surface 
after 7 days remove it and change it with new paddy straw 
and apply lime @ 10 kg per bigha

if u se potassium permangate , you can use @ 300 gram per bigha