True story, I just got an acro frag and found the perfect spot in the tank. I HATE plugs, my tank doesn't have a single plug in it so I took the acro off the plug to glue directly to the live rock. I took some gel crazy glue and covered the base of the coral. When I squished the coral into the hole on the live rock a bunch of crazy glue squished out. No biggy I thought, eventually the coral will encrust over it.
Well, my bird wrasse saw the glue and thought DINNER! He started picking at the goo right on the rock, strings of crazy glue were attached to his beak and the rockwork. He was taking globs and swallowing them! I was freaking trying to get him away from the glue but he was possessed, he absolutely loved the taste of it! I thought for sure he was going to die.
I quickly started feeding him big krill hoping the food would at least mix with the glue inside him. Its been weeks now and he's just fine, I guess he passed it or something. I was just picturing it hardening inside of him and killing him...
So ya, I'm never putting soft glue in my tank again...lol