Help!! Glass nem

So i have a tank with a dwarf lion fish and a green bird wrasse are there any good ideas for getting rid of the the explosion of glass nems from a rock with coral on it that i bought other than trying to put those fish in a different system while i go at this one with both chemical and biological attack as in peppermint shrimp wich i would be surprised if they hit the bottom of my tank before they where food for the fish mentioned above

 

Assortment of reef safe hermit crabs and snails

 

The crabs have been disappearing faster as of late