damsels are mean fish.i had a yellow tail and he stresed(killed)out four royal gramas,two pajama cardinals.this killer was only a inch and ahalf long.i have a blue damsel now and he goes after my purple fire fish.when this one dies i will not be buying damsels again.i still don't no why the lps says these are good beginer fish.until you go to add more fish they scare the life right out of them