I wouldn't stay away from damsels because in such a small tank a small hardy fish sometimes is all that there is space for, which a damsel would be a perfect fit. Also if you are implying to stay away from all damsel species, you are also saying stay away from all clownfish, as clownfish are damsels. Don't mean to sound like a smart*** but I'm just mentioning for future references.Clown fish, Firefish, Royal Gramma, some Fire shrimp, Cleaner shrimp and STAY AWAY FROM DAMSEL all species.
Note:
Refer captive breed species if you can buy/find around your LFS or online.
My bad, I was meant to stay away from Domino, Blue Devil, Velvet damsels, those are meant one and those are readily available all LFS, once they established in a small tank they most likely will harass other fishes and stress them out and stressed fishes might catch ich.I wouldn't stay away from damsels because in such a small tank a small hardy fish sometimes is all that there is space for, which a damsel would be a perfect fit. Also if you are implying to stay away from all damsel species, you are also saying stay away from all clownfish, as clownfish are damsels. Don't mean to sound like a smart*** but I'm just mentioning for future references.