What is this brown scab?

threebuoys

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what is this scab.jpg


Any ideas? Looks like a fungus on a tree
 
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threebuoys

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kind of leathery soft It does not look like the pictures of scroll algae I've seen. It is tightly adhered to the rock. No sign of other layers growing. It is a very dark brown, not really translucent, although it is a little difficult to tell for sure since it is adhered so well to the rock.
 
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Any other ideas on this? In the photo, it appears to be above the surface of the rock, This is an illusion, the growth is tightly adhered to the rock. If I want to remove it, I would have to scrape it off..
 

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Any other ideas on this? In the photo, it appears to be above the surface of the rock, This is an illusion, the growth is tightly adhered to the rock. If I want to remove it, I would have to scrape it off..
Do you see any holes in it like a sponge? I’ve seen pics of large brown sponges in the ocean but not in someone’s tank.
 
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threebuoys

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No holes it it. My first thoughts when it appeared was algae or sponge but I haven't found a picture yet that comes close to what I see. I'm sure there's a picture out there somewhere, I just haven't been able to find it. It began very small and has grown now for about 5 months.
 

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No holes it it. My first thoughts when it appeared was algae or sponge but I haven't found a picture yet that comes close to what I see. I'm sure there's a picture out there somewhere, I just haven't been able to find it. It began very small and has grown now for about 5 months.
Sort of similar

A76F855A-7A0F-453A-9966-B8F76537AFDB.jpeg
 
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threebuoys

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Sort of similar, but different. This one forms a bowl and does not appear to lay flat against the rock like mine. The color in this picture is not nearly as dark, but reasonably close. It looks a little more leathery than mine.

I assume this is the scroll algae you suggested earlier? This one is definitely more attractive than what I have going on.

I also looked at pictures of scroll coral, but they didn't match up either.

Thanks for trying to help!
 
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