questions: asked about  green algae removal and common carp breeding 
 answers: remove the green algae by using mosquito net and then apply 10 to 20 bundle of dreid paddy straw
and change after 7 days, continue for 14 days
copper sulphate 130 gram per bigha or 1 kg per hactare : last option
breeding happa only one is required
egg should be tranfered in clean tank or pond : already prepared pond with plankton
ovatide : male-0.2 to 0.3 ml/kg of fish and female 0.5ml/kg of body weight of fish. 
egg formation or fertilization after 8 hours to 42 hours
egg attachment substrate : water hyacinth or meteka or hydrilla