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Good to know I’ll see if I can delicately scrub that off with the brush I use.that appears to be a sponge. it should be carefully scrubbed off using a soft bristle tooth brush. You need to be careful not to scrub the flesh of the coral. This could cause damage that leads to infection, recession, and even brown jelly disease. If you leave the sponge you risk it growing onto the coral flesh or irritating it causing recession and possible infection.
I don’t think so those are usually white from what I’ve seen. Have tons in my tankSpirobid worms?