depends what type.I had a nice red sponge but it died.Apperantly they don't like the light and they are filter feeders.I had to much light where I kept the sponge.
In time you will have sponge growing in your tank with out having to buy it. I found a large Pink sponge in my tank when I changed over to my new one. I placed it under my Montipora cap for shade.
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