Bristleworms in hospital tank

[WW123]

I’m using an old 16 gallon biocube (with a sand bed) as a hospital tank for a tang. I added seachem cupramine last evening and today the surface of the sand was littered with bristleworms. They didn’t all look dead but rather slow. Thoughts? I’m trying to maintain copper levels but now I’m worried about a die off and toxic water for the tang.

 

[vetteguy53081]

I’m using an old 16 gallon biocube (with a sand bed) as a hospital tank for a tang. I added seachem cupramine last evening and today the surface of the sand was littered with bristleworms. They didn’t all look dead but rather slow. Thoughts? I’m trying to maintain copper levels but now I’m worried about a die off and toxic water for the tang.

Lift each out with spaghetti or ice tongs and discard