What works best for me is cutting a piece or usually allot of pieces trying to get base and polyp on each piece. I then drop in a tank with low flow on coarse substrate so they attach on their own if this is not possible I use a rubber band to hold in place on rubble making sure it is only tight enough to loosely hold in place otherwise it will cut through. Glue has never worked for me with fresh cut softies they have always separated. A good site to check is Garf.org