Thank you Ottoman, I will keep in check with DKH. It has been a few hours after setting up now, I am still seeing the pellets attached around the body inside the tube and are attaching to each other, even I let the pump flow maximum to 400GPH. I took the whole thing out and stired them, but as long as I run the reactor , they attached to the tube again and some of them even were floating to the top. Good thing I put a mesh there. I am not sure what to do next if they are still clumping like that.
WHAT DID I DO WRONG 