Strange texture in videos.

Everytime I finish editing a video, a grain texture appears in the video. It is most common in the scenes where there's no light. I want to know if I can use any other software or a tool in Final Cut.

I added an image I found.

Low light noise, comes from the camera, not the software.

There are many noise reduction plugins that work with FCPX, but there is no substitute for proper lighting and obtaining good exposure while filming. That eliminates the need for fixing in post.

When it is impossible to light scenes properly, the resulting noise can be improved with plugins from Tiffen (DFX Bundle), Neat Video, and other vendors.