what do black widows do

[hellohefalump]

I have a large gravid looking female (i think) who is being chased around by some of my other, not gravid (male?) black widows. They keep rubbing themselves against her side. Is this normal behaviour or is she ill?

 

[hellohefalump]

anyone? I mean the tetra not the spider...

 

[WILDER]

This might be of help.
http/www.aquarticles.com/articles/breeding/#Characins