Applying reflectivity to a material or mesh

I want to make the mirrors, metal, and granite on the wall reflective, and when I inserted a reflective probe, it only brightened the scene. I've turned off reflectivity on all materials I don't want to be reflective, but the mirrors and metal show no reflections. The probe has the default settings. I looked at similar threads without results. So whats the best method for making either certain materials or objects reflect the surroundings?
Thank you

 

Here's an attachment of the scene in question

 

OK, I've figured out that the probe needs to be a child of the reflective objects, and I've gotten them to be reflective. But the scale of the reflection is too large, so is it possible to reduce the size?