bearded fireworms ate my watchman goby :(( help

[catiebartholomew]

i’m sure i have bearded fireworms. i won’t attach pictures for your sake. mfs ate my juvenile watchman goby. i have quite a few small fish in this tank that i wouldn’t want to get stuck in a trap (especially with said fireworms). does anyone have any suggestions on how to get rid of them / lessen their population (short of breaking down my tank)? this tank is a 115 gal mixed reef w peaceful stock. i have a coral banded shrimp in there but it hasn’t done much of anything in months - just hangs out under one rock. thanks

 

[Cell]

Definitely need pictures.

 

[Uncle99]

Arrow crab…..
Melanurus Wrasse.