What kind of glue can I use underwater to anchor frags and rock pieces with that actually "cures" underwater without disturbing water chemistry. I bought that Two Fishes brand of there "mighty putty" and that didn't work worth a hoot. I bought some super glue gel and that worked on small pieces I could actually take out of the tank. But I am looking for something that cures underwater since some some of the pieces I want to glue to is my base rock.