I wouldn't use it. Not sure about the chemical safety, but the amount that it expands when drying is problematic in mounting corals. Use the gel superglue or putty that everyone else uses. Not worth the risk unless you have a separate tank in which to experiment.
Gary
Yeah well I used some of the gorilia glue on soem shoes and wow it foams alot. I just wondered. i use super glue gel or IC gel most of the time. Thanks for all your input.