I have a 180. In it I have:
Lyretail Anthias Shoal
Lawnmower Blenny
Purple Tang
Scooter Blenny
Mated pair seabae clownfish
Royal Gramma
Long nose hawk
Mated pair of Green cromis
Firefish
assorted snails (huge zebras, star snails, olives, nassarius)
Skunk Shrimp
Arrow crab
Emerald crabs - 3
red linckia star
sand sifting star
3 large feather dusters
Sally lightfoot crabs - 2
peppermint shrimp - 3
marble sea star
seabae anemone
strawberry sponge
green tridacna crocea clam
LPS: torch, hammer
SPS: monti caps, acro
Zoos: eagle eyes, pink, yellow, button polyp
Softies: Pulsing pompom xenia, branching xenia, small toadstool
mushrooms: Red, blue, red-spot, ricordia
I think that covers it.
Future additions: Daughter keeps begging for a flame angel but I really do not want one - I would love to add a saifin but I think my purple would not be happy. I will be slowly removing some of the softies and in their place put more SPS. I like lots of fish activity in the water column and my wife likes the activities of inverts - hence why we have so much variety.
Anything else you wish to know?