Is this sponge ok?

[BubbleMyTip]

It has turned a little black. Only thing changed recently was some fresh GFO. Comments welcome! Pic taken at night (Chromis hideaway...)

Many thanks.

 

[SeaCucumberFan]

What sponge is it?

 

[AlSimmons]

Yeah, those are fine. I have a bunch in my tank too and they've never harmed anything. I believe they're referred to as a Worm Sponge. (Carteriospongia vermifera)

 

[SeaCucumberFan]

Oh worm sponge. That looks fine. I think that it's natural

 

[BubbleMyTip]

Thanks. So it turning black is not a concern?


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[dendrite]

I have some on a rock. The part that's deeply shaded is white, and the part that is in moderate light is black with degrees of pigmentation in the intermediate zone. Grows fast but strips off easily

 

[AlSimmons]

Thanks. So it turning black is not a concern?


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IME the more light the sponge receives the blacker it gets. So no, I don't think what your seeing is a bad thing.

 

[BubbleMyTip]

Great. Thanks.


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[Gone Tidepoolin]

I've had that in my tank for 5+ years. Some white, some blackish and some greenish. I have had no problems with it, it's a nuisance when it becomes dislodged and floats around. But in the big scheme of things, no big deal.