I have a 90 gallon macro tank with 1 azure damsel, 2 yellow damsels, 1 purple dottyback and one diadema dottyback and I love the interaction between them all. I also have a mandarin and a cockatoo waspfish but they stay hidden. I personally think damsels are the best saltwater fish considering their bright colors and super cheap prices. I'll put it this way, if azure damsels were considered rare and costed over $200 there would be one in every reef tank and DD would put one up for sale every night lol. Seriously though I think you should go for it, if it were me I'd add them all at once and try to get them as closely sized as possible, assuming your tank can take that bioload which shouldn't be much with 5 small fish. The other awesome thing about damsels is they are easy to feed and could live in a toilet!