I have colonies of hammers. They like a bit more nutrients in the water... They don't like a ton of flow. Mine are fairly tolerant of a lot of light.
When I have fragged them in the past, I have had some frags that will die off for no reason whatsoever. Perhaps you had a frag that just puked out. I have a colony I am looking at now that is bigger than a basketball. If you were close by, I would offer you a nice piece. They are great to have in a reef tank.