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Small tanks, or "nano reefs," are under 30 gallons, and make it affordable for fish-lovers to own a reef aquarium, says Acland, who notes that large-scale models are very expensive. "The nano reefs ...

Sometimes it can be relaxing to peer into a fish tank and just pass a few minutes in quiet contemplation. Just you and the fish. But if you’re at work, this isn’t really a very practical way of ...