My 65g isn't crowded, lots of room for coral growth, but there's still quite a bit going on. Right now I'm keeping:
Xenia (pink)
GSP
mushrooms (3 colours)
zoanthids (7 colours)
yellow polyps
palythoa (brown, hitchhiker)
ricordia (green/brown)
yellow leather (sarcophyton elegans)
Acan echinita (hitchhiker. Right now it's brick red, starting to show some green)
branching hammer (brown with cream tips, starting to look greener)
wall hammer (brown with pink tips)
torch (brown/green with bright green tips)
frogspawn (brown with pink tips)
bubble (baby pink)
fox (pinkish brown)
candycane (neon green and red/green)
There are 8 fish:
coral beauty angel
flame angel
white tailed pygmy angel
Talbot's damsel
South Seas damsel
yellow clown goby
Lubbock's fairy wrasse
pixy hawkfish
There's also a pincushion urchin, two chitons, and one turbo snail. There are about 15 small hermits, but every once in a while the hawkfish has one for dinner or I'll add a few, so the number goes up and down.
My 21g doesn't have as much variety but it's turning into a nice little tank:
yellow polyps
mushrooms (4 colours)
zoanthids (4 colours)
GSP (fluorescent green)
Xenia (pink)
tulip anemones
open brain (red/green)
Fish:
Ocellaris clown
neon dottyback
orange-spot shrimp goby
There's also a pistol shrimp, along with two Trochus snails, 5 Astraeas, a few dove snails, a couple Hawaiian hermits, some bluelegs, a scarlet and 13 nassarius snails.