Live rock growing colours

[david92]

Just wondering what the dark green and yellow patches are on this one piece of live rock

 

[Timfish]

Yellow is likely sponge and beneficial. The dark green is likely algae or cyano, if it wipes off easily it's cyano

 

[david92]

Yellow is likely sponge and beneficial. The dark green is likely algae or cyano, if it wipes off easily it's cyano

Thank you an I'll see if the green patch wipes off