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Present work is pursued to examine the 3D bioconvection Casson nanofluid flow between two rotating and stretchable disks. The consequences of Darcy Forchheimer flow along with thermal radiation, magnetic field and heat source/sink are analyzed. Effects of thermophoresis and Brownian motion are also considered. Flow related partial differential equations are converted to the ordinary differential equations by using similarity transformations. Shooting technique is applied to solve the prevailing equations with the support of MATLAB Packages. Radial and tangential components of velocity for different values of Casson parameter, magnetic field parameter and porosity parameter are depicted through graphs. Temperature profile on varying the values of Prandtl number is also discussed. Moreover, thermal profile for increasing radiation parameter, thermophoresis parameter and Brownian movement parameter is analyzed. Nanoparticle's concentration effects on micro-organisms with growing Lewis number and Peclet number are studied graphically.