Question: asked about control of green algae and haemorrhagic septicaemia
Answer: let 10 to 20 bundle of dried paddy straw on the water surface and change it after 7 days with clean and dry one continue for 1 months. reduce the quantity of feeding. 
apply lime @ 10 kg per bigha
apply 260 gram potassium permanganate per kotha once for haemorhagic septicemia 
(potassium permanganate dose for oxygen is 280 gram per bigha )