One of my favorites. I'm gonna have to disagree with cecilio on the feeding though... sounds like water quality issues on the horizon to me. Hammers really don't need supplemental feeding given enough light. Keep your CA and ALK in check, provide moderate flow, and you'll be rewarded with a beautiful and happy coral.
The only time I feed mine is when I happen to be feeding other corals, I may throw a squirt in the hammer's direction - even then, I doubt the usefulness of doing so.
T