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Old 02-06-2004, 12:34 AM   #1
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white, coral type substance

anyone know what this white stuff is? It has some small black dots that have formed in it in the last few days.




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Old 02-06-2004, 12:52 AM   #2
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Sponge, the black dots are actually holes , or siphons for the intake and outflow of water.
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Old 02-06-2004, 12:59 AM   #3
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so sponges can be extremely hard, like a calcium deposit?
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Old 02-06-2004, 01:42 AM   #4
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There are many types of calcareous sponges. These CaCO3 formations can often look just like many types of encrusting corals rather than the sponges they are. Ever noticed those "jelly" looking formations laced together on the underside of LR or in darker areas of the tank? Those are another form as well.

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