If everything works then put it all together. Put the pump and valve in the motor cavity. You can remove the power cord for the blender and put the power cord for the pump in the same place. Put the cover back on. Then put the tank on top of the unit as it should go. That's it! your done. Now have fun. You can fill the tank with rocks and plants and of course fish. I had a snail in mine for a long time and it worked well.
You might want to put some ventalation holes in the lid. For my blender the lid has two parts. The black rubber outer part and a clear plastic part that can be removed. I drilled holes in the clear part but mostly I just have the clear part removed.