Mystery item .

[rick thompson]

Does anyone know what the substance is that is growing on my rock?

 

[Fish Fan]

Welcome to Reef2Reef!

#WelcometoR2R

I can't make much out from that picture, maybe post some pics with your white light on and the blues off?

 

[Uncle99]

Agreed, way too blue, can you retake that in white?

 

[StartingATank]

Maybe some kind of sponge? I have seen some people get sponges that look like this, but this one seems to be photosynthetic.

 

[rick thompson]

Sorry, I took as much blue out as I could. It still looks blue for some reason but it’s a lot better. It’s about 4“ x 4“ it’s been in the tank for quite a while. I hadn’t paid much attention to it though and now that it’s getting bigger a little concerned it seems to be about an eighth of an inch thick, and it’s not hard. It’s probably similar to leather or rubber.