? glue

I like a combo of super glue and epoxy putty. put superglue on the frag, then the epoxy, then more superglue and smash it to the rock.

For epoxy I prefer PC Plumbing epoxy. It's gray, and cures in 3 min. You can find it at HD with all the glues and aquamend and stuff. Perfectly safe, it's the same thing as all the other epoxies, just with more hardener :)

for superglue, the 3 tubes of gel for $1 at the dollar store can't be beat :)
 
<a href=showthread.php?s=&postid=12201548#post12201548 target=_blank>Originally posted</a> by maxfam
need to attched in tank

Both the super glue and epoxy will cure under water perfectly safely.
 
What they said.

Just be sure to get the gel, not the liquid stuff. I've learned that one the hard way with streamers of cured superglue flying around the tank :)
 
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