Sterilize the soil with disinfectants preferably with colloidal silver (SilveNex) or Oxidizing Biocides (BioseQre) rather than with harsh chemicals. Simultaneously use larvicides.
After three days of such disinfection spread 2 Kg RichBottom tablets per acre. To get the best results apply 1 kg P Soil before stocking.
RichBottom contains
Nitrogen fixing microbes.
Microbes that can solubilize Minerals.
Microbes that ferment the unspent feed, dead animals, dead algae, excreta of the animals and make them bioavailable to the inhabitants and plankton.
Microbes that can inhibit pathogenic bacteria, yeast, fungi, algae, virus,
protozoa, LB, Vibrio etc.,
Microbes that secrete organic acids, Microbes that secrete Enzymes, Microbes that produce single cell protein.