The Encrusting Horn coral has neon green skin/body and mix of puple and dark green polyps. 
The Encrusting Horn Coral is a SPS coral often referred to as Knob, Velvet Horn, or Branch Coral. The most common form is green with darker green polyps, but less commonly will be cream in coloration with neon green polyps. This species is encrusting, and will grow over the adjacent rockwork. This species may also develop horn-like branches, reaching out into the water column. Hydnophora sp. corals have the ability to swell their tissue, giving the coral an inflated and fuzzy appearance.
The Encrusting Horn coral with moderate to strong lighting.
The Encrusting Horn coral prefer moderate water flow.
Hydnophora sp. corals can consume relatively large meaty items by consuming it outside of the skeleton. Offer zooplankton, brine or mysis shrimp, or other chopped meaty items that are marine in origin to supplement its diet.
Disclaimer:
Corals on the pictures are not WYSIWYG, photos was made under different lighting (blue or white lights) and in different tank (our show of frag tanks). You will get coral size as described, shape and color could be slightly off due to shipping stress.