I currently have two 20-gallon marine aquariums. One is a reef and the other is for invertebrates that are not entirely reef-safe (for small reefs anyway). Here are some photos of the various critters inside them.

Bumblebee shrimp (reef).


Haliotis sp. abalone (non-reef).


Green cabbage leather coral.
Green cabbage leather coral (reef).


Clibanarius longitarsus
Clibanarius longitarsus (non-reef)


Ophiarachna incrassata green brittle star with Calcinus seurati hermit crab and Echinometra lucunter sea urchin in the background (non-reef).


Cabbage leather coral.
Brown cabbage leather coral (reef).