Today I bought 1 hammer coral and the seller tell me that it was an metallic green wall hammer. The color don't look like green here are some photos try to ID.
Maybe it's because I'm looking at it over a galaxy s4 phone but it doesn't look like a metalic green hammer to me. But there are so many varieties in colors and even the tip shapes of the hammers.
This is a new baby metalic green branching hammer that I have and a purple and green
What are your water parameters? It might just need a little time to get used to your tank. Did it look green in the store and what lighting was it under there?