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Weird stuff

I have that too. I never figured it out or even bothered to look it up but, I just assumed it was some sort of sponge..
 
Probably bacteria, it’s a good thing but ugly
 
This stuff
 

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Also what’s this green carpet stuff on the rocks
 

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Looks like sponge or tunicates to me. Green stuff is just algae, dry rock starts white then turns brown/green with algae growth and then pink/purple with coralline if you have good lighting and parameters.
Looks like sponge or tunicates to me. Green stuff is just algae, dry rock starts white then turns brown/green with algae growth and then pink/purple with coralline if you have good lighting and parameters.
so is that white good or bad
 
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