Acan lords = Acanthastrea lordhowensis. It's a species of LPS (large polyp stony) coral from the Western Pacific and Indian oceans. It's very popular in the reef community and comes in a dizzying array of colors and patterns.
It's really not possible to tell from your photograph if your trumpet is bleaching. If it's new to your tank, placing it on the sand as you've done is the right thing. You can slowly move it up in the water column every week or two until you get it at the preferred position.
Note that trumpet corals benefit from being fed. Mysis shrimp is a good choice for this coral, as are prepared coral foods in the larger pellet sizes.