There are some gorgonians that are non-photosynthetic. Some easier shrooms like purples and reds are pretty easy to keep in low lights along with xenia. You're pretty much gonna be looking at soft corals, but you may not even be able to keep that depending on your light. What is the wattage on the lamp and what kind of light is it? On a tank as small as a 5.5, you can get a mini light fixture for pretty cheap. Coralife makes a CF mini-fixture for about $30.
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks
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