Glue? Macros to Rock?

I love that red grape-need to try some of that again in my tanks. How do you guys attach dragons breath? I've been just jamming it in spots or under rocks but seems to always float away. I had some blue scroll pop up in my tank and have been supergluing frags of it all over, it dies where the glue touches but grows fast enough over to stay anyways.
 
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