I dont use the brand, but I frequently use cheap $2 SuperGlue. The SuperGlueGel would also work, and this prevents glue "running" everywhere when your trying to aplicate it.
Id recomend you glue these frags outside the aquarium. Get two containers, one to work in, the other (half full with tank water) to hold the coral whilst preparing etc. Dry the two surfaces, and apply glue. If the coral is sufficiently large, you may have some difficulty attaching it with just glue, and you might need to tie it with fishing wire, or use toothpicks (plastic version) punctured through the coral, tied down to rock. Afetr your done, leave it in the container of water for a moment or two, and shake it lightly to remove any excess slimecoat.
Then, once back in the tank, stable water params, flow, and lighting, your coral should attach in no time!
