I guess 55G tank? Have you ran any tests since setting up? Trying to figure out if ready for fish.
Why damsels?
Damsels do better in groups and can be mixed with certain types (Have kept Domino, Striped, Devil, Y/t Bules and even chromis together but ONLY in great numbers). I feel that when kept in number, less aggression towards just one individual.
But there are other fish available that you can keep w/ or w/o Damsels to start off provided that your tank is well established biologically (cycled).
16 LB of
LR is better than nothing but should have more so LR will be primary biofilter thus can handle more bioload w/o mechanical equipments and it['s more natural than artificial deco, IMO.