I was given a huge peice of gsp from a friend, I didn't dip it because I was worried about some of the dip being absorbed into the rock and ending up in my tank. This morning I noticed a large bristleworm in the mat. I've never had a bristleworm in my tank and I would like to keep it that way. Can I dip this large peice as long as I rinse it very well? I tried sucking him out with a turkey baster and with tweezers but he's too fast.