Hi Josh,
Welcome here!
For low maintenance/light tank and non-CO2, mosses are good choice as they are mostly hardy in most cases.
Use light to acheive about 0.5 watts per litre or 2 watts per gallon. Your 5.5 gallon tank is small. Try use a flourescent table lamp but not too close to it, keep the light about 50~70 cm above the tank. Make sure the water temperature does not rise above 27 degree celcius during light on period.
A tiny (get the smallest you can get) hangon filter is more than enough. Any type, wheels does not matters. If your fish load is low, say 2~3 cardinals load and once a day feeding, filter is not compulsory.
Have fun.







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