what fish should I get?

I have a FO 55 gallon tank. It has a 2213 Eheim filter, A prizm deluxe skimmer, normal lighting, crushed coral gravel, two maxi-jet 606 powerheads, and plastic decor. I have two yellowtail damsels, and an ocellaris clownfish. Just wanted some suggestions on some easy colorful fish.

cant really say maybe a firefish?

firefish are pretty cool, but aren't they a little too timid for those damsels. By the way, this tank is about 9 months old.

Ok here we go,

the damsils at a little on the agressive side, so you better watch-out with them,

Some easy to care for fish that are colorfull,

My favorit, royal gramma (gramma loreto)
Its a small fish about 2-3 inch, amazing color and easy to care for, also not really agressive.

Colar beauty Angel (Centropyge Bispinosa)
A great fish, that does require a little special care, as it needs both a meet and plant diet to stay in tip-top shape. It is commenly available and get adapted to aquariums fairly easy.

Fire Fish (Nemateleotris Magnifica)
A really nice fish, with a smooth color change, feeds on a meety diet, and is not hard to care for, when 1st added it can hid under a rock for up to 3 days, but when adjusted to the tank, it swims around. Dont add more then 1.

Those are some of my favorit,

some good choices also are,
Gobies, Angel fish (only pygmis, like the coral beauty)
try to stay away from tangs, as they all need 75g or larger, tho if you have a fair amount of algea in the tank, a yellow tang could be fine.

Thanks lionfishy, I have had all of those from the same place, they died within a week. I have know decided that it is the place that I am getting them from that is the problem. Know I am getting them from liveaquaria.com

This summer, I am going to get live rock.

Be shure to cure it,
before you add it,
or a ammonia spike will happen

or get pre-cured rock

are you gonna get any coral?

I have the jbj nano cube. It has live rock and corals. But I am going to keep only fish in the 55. Don't have enoiugh money for lighting yet. But you never know I might start a reef someday. I am actually pretty interested in those white ribbon eels. I thought that maybe I could ditch the fish I have now and get one along with a lionfish or something.