They could be hiding. I only have a BC29 and I swore my orange spotted goby was dead and then one day he popped out. They find a spot and sometimes they just stay there until there ready. Don't count them out just yet.
Damsels are very very aggressive you do know that right? I had to re home 2 of my yellow tails because they would attack all my fish and even each other.
"When creating an aqua scape, strive for the beauty of imperfection, as its art and there is no wrong or right, it's left open for interpretation" James Findley