Any Sponge keepers in the house?

I am really keen to keep sponges in my (yet to be constructed) 55 gallon tank. I am looking for sponge species that are hardy and preferably grow fast. They will live with a bunch of cleaner snails, rock and sand. I do not plan to keep any other coral or fish with the sponges.

Will really appreciate if you could share your sponge keeping experience [smilie=nod.gif]

In particular, I was looking at 2 species:

  • Collospongia auris
    Collospongia-auris-blue-photo-sponge-2.jpg
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    Callyspongia vaginalis
    x_sponge_purple_tube1.jpg
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