I took a syringe and tried to stab a few not sure if I got any. I also used the syringe with peroxide and squirted it in the tube. Snails did not like that others I covered with glue.Be cautious with adding the coris - likely will go at it with the melanarus.
A suggestion- may work/may not (but it’s free). try cracking a few vermatid shells so it can get a taste for them.