I'm noticing a white gummy substance growing on my live rock. There is one larger patch about 1" circular, and several small patches on various rocks (pinky nail size).

I know that the LR I bought had some orange, red, and black sponge on it. Is there white sponge as well or is this something I need to worry about? The colored sponge doesn't appear to be growing much, but the white stuff seems to be expanding quickly.

Will post pics when I get home tonight.