3D Viewer - Reconstruction

Hi, I’m completely new in this area so I hope there is someone who can help me:)

Project: I take a image stack of some particles in a fluid - the distance between the images is 1mm. Now I want to reconstruct the seeding particles with the help of Fiji+3D Viewer. I use a camera with a pixel size of 3.45x3.45 um.

What I have already done: Image --> Properties --> Pixel width: 3.45 Pixel height: 3.45 and voxel depth–> 1000.

If I open the 3D viewer, I get a reconstruction but I can see every single image - so is there a opportunity to get a better reconstruction/result?

Hope that makes sense …
Thanks in advance!
Verena