Royal Gramma (Gramma loreto) ... is a basslet, a.k
.a. the Fairy Basslet. They don't like other basslets. The clownfish is actually a tough guy too, so you'd not need to worry about him anyways. The Royal Gramma should be rather peaceful to the others, they just don't like their own kind. It does prefer caves and the like, and it may hide from you (I don't know, I've never had one) but it really is a beautiful fish.
125 gallon saltwater: 55gal sump, 4 Blue-Green Chromis, Purple Tang, True Perc, Firefish, Royal Gramma, 5 Ricordea, Bubble Coral, 15 Pulsing Xenia, Green Star Polyps, Deresa clam, Green-Tip Torch Coral (about 11 "heads"!), Orange Montipora Cap, Purple M. Digitata, Green Slimer Acro. Yongei, 3 Orange M. Digitata, Pink&Green Acro. Millepora