One is a Sun Coral 3" at the top the bottom rock is about an inch with irregular bottom. the other is a leather on a finger of rock. Super glue is not bad for the tank
You may end up placing a net around the rocks to hold the corals in place or placing the rock/corals in a very low flow area to avoid the corals being blow off by the water current. Most soft corals should attach to the rock in 4-7days.