Try to keep your water really good for them.
Also try to be patient, I know it is difficult, but try to be patient with it.
My RBTA hid under the rocks upside down in the back of my litle cube tank for over a year before it finally decided to come out in the open to be seen.
It then took almost another year before my black osc. clowns decided they could use the anenome as a home.
Good luck.