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These ought to be enough for some months, as it is not safe to add too many at once. Then the green weeds Codium tomentosum and Cladophora may be tried; and, still later, the beautiful Bryopsis plumosa. But it is much better to be content with a few Ulvae, and others of that class, to begin with; for a half dozen of these will support quite a variety of animal life.
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