blood worms
 

As discussed in an earlier post, I went ahead and moved my egg crate
mattress pad to a different 'box', with plumbing. It serves as both
mechanical and bio filter and is fed by a filter which is primarily bio. I
noticed when I moved the material, there were a small number of blood worms
in the gunk in the folds of the mattress pad. Is this cause for concern?
Thanxx
Bill Brister - Austin, Texas