Mine does best in full light, high humidity, but not wet roots. Try pinning a small sprig with roots to the background closer to the lights and where it will get misted frequently enough so that it doesn't dry out.
Edit - Also, if you plant a large clump, much of it will often die, but then it'll adapt and start growing. It looks like yours does have some new growth.
Edit - Also, if you plant a large clump, much of it will often die, but then it'll adapt and start growing. It looks like yours does have some new growth.