Say "how big is your tank?"
I'm thinking it will not be an easy catch.
A perfect reason an warning to others:
Do extensive research BEFORE you add a fish.
Hindsight is always 20/20.
Clown Gobies are (strangely enough!) rated "reef safe" or reef compatible....that is until You read "unless your have an SPS dominate tank with Acropora or similar corals" OUCH!!
Maybe someone will come along with a good way of catching them out....
Just don't envy you at this point tho. How bad is the damage?