Super glue...

[Congaken]

My Nano 10 is starting to look like a mass of white lava...I guess that I'm not too neat with the SG underwater...any suggestions that work and hold better...?

 

[saltyfilmfolks]

Small pieces. I do in my hand, frag+ glue+putty+Glue, then on to the rock.
same with larger aquascaping. But I use waterweld putty because it is harder when it sets.
the aquastick is a bit weak, so you can move the coral around if it doesnt like the spot.
Gel Superglue from the dollar store or home depot. Aquastick putty from the store or amazon.
and practice.

 

[Zane]

Just glue the frags outside the tank before you add them. It only takes a small amount of glue to hold one down.

 

[BryanS4]

Just glue the frags outside the tank before you add them. It only takes a small amount of glue to hold one down.

This.

I can't say I've ever even considered gluing a frag in the tank underwater.