does anyone scrub new liverock with a brush

[Raf]

depends what shape it is in. Liverock that arrives in good shape and stays in good shape may need little to no maintenance......on the other hand, liverock that has been sitting on some boat or beach in the sun and then in boxes for hours/days at the airport may need lots of maintenance. I would say dying sponges are good to scrub off either way.