As said above. the reefers use it all the time for attaching extremely delicate corals to rocks or plugs for years with no ill effects. I have over 30 anubias and java ferns that are all attached with AC glue to smaller rocks and then placed on the larger rock sculpture. Take a look:
Also used super glue to attach my Anubias to the driftwood. So far no problems with the fish. Just hope it holds long enough for the roots to stick to the drifwood.