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Not a sponge?It’s not cyano and I don’t see any hole for it to be a sponge?
I used to have black sponge in my old tank.Nah not a sponge , no intake hole
Got loads of sponges , yellow , blue , clear and I recognise they have a certain porous appearance but this stuff it totally smooth
that definitely looks like a red sponge to me.
Here’s the same rockIt looks like a sponge to me as well. You say it's spreading. How quick does it spread?
I'm still thinking it's a sponge. Did it just pop up over night? Or did it take a few weeks (months) to spread?Here’s the same rock