mystery substance

[HARRYMANIA]

can anyone identify ? out of water it looks almost like the trail a slug would leave behind but it is from a salt water tank on several rocks....

 

[NYreefNoob]

looks like some type of sponge

 

[LongIslandAndy]

dying sponge ?

 

[cybermeez]

Yeah, sponge.

 

[ourcoralreef]

Does it peel off how does it look when you try

 

[coralcruze]

sponge... have a ton of it in the tank.

 

[CullyisGully]

looks like some type of sponge

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