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-   -   white, coral type substance (http://www.aquariumadvice.com/forums/f18/white-coral-type-substance-16582.html)

yaksplat 02-05-2004 11:34 PM

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.

http://www.cse.buffalo.edu/~vrana/white_coral.JPG


Thanks
Jim

reefrunner69 02-05-2004 11:52 PM

Sponge, the black dots are actually holes , or siphons for the intake and outflow of water.

yaksplat 02-05-2004 11:59 PM

so sponges can be extremely hard, like a calcium deposit?

steve-s 02-06-2004 12:42 AM

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.

Cheers
Steve


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