yes its possible to use a berlin system in a nano tank.
nano tanks are inherently unstable, so constant care and monitoring are required.
im not sure if this is your first tank, but i would not recommend this if it is your first SW tank.
as far as inhabitant you are limited. you can have your share if snail and small crabs, even a cleaner shrimp or peppermint shrimp or two.
For fish you are really limited to damsel fish, like damsels, clowns and chromis. you can also look into other small fish like firefish, and gobies.
many people try to do a anemone and clown fish combo, bu tthe needs of anemones are uite high, and its not recomemnded for newbies.
another very interesting (more so than the clown and anemone in my opinion) is a shrimp goby and a pistol shrimp.. do a bit of looking on shrimp gobies. the interaction between the two, is truely awesome..
Rob
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