Same as Krazy glue...just more $$I only have a couple of plants attached to deco but used super glue for this. I was a bit afraid to use actual super glue but I trust Flourish and they put out an aquatic safe glue for this. Just put a drop on the side of a plant and hold it against the deco for like 5 seconds and done. It even works under water. I have had zero issues using this stuff.
Seachem - Flourish Glue
www.seachem.com