The form and color of sponges are extremely diverse: balls, mats, or tubes, in red, orange, yellow, brown, or gray. They attach themselves to a support (rocks, but also dead coral or mollusk shells) and shy away from the light. Sponges seem to proliferate spontaneously in marine tanks, as they can be introduced, in sizes invisible to the naked eye, along with other invertebrates, live rocks, or in water. Both the common and scientific names are little known and it is difficul to ascertain with any exactitude which species are found in the aquarium trade in the absence of detailed research.

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