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I would be afraid to mix species myself, especially species that look similar. I have only done all the same specie and found the yellow tail to be the most docile.For a bit of variety what do you think if I put in a pair of Yellowtails, an Azure and a Blue Devil? Or is it safer to maybe do a pair of Azures and a pair of Yellowtails? Thanks.
I have had yellow tail damsels in with firefish before and it has never been a problem. I have always put the firefish in first so that the tank is his territory prior to adding damsels however.I'd be nervous putting a damsel in with firefish unless it was a pretty large tank (firefish seem to get picked on by even semi-aggressive fish). If you must have a blue damsel, I'd look for an orange tail (least aggressive in my experience).
Good that’s what I prefer.Azure for me, they are smaller, more peaceful ime and a better colour pattern.

