My husband just brough a bunch of live rock home from the LFS. He was told it was cured so he dumped it into the tank but then noticed that it has A LOT of junk still on it. He took it out of the water and ran a soft bristled toothbrush over it and A LOT of junk is coming off of it. Do you think it's cured? Is there anyway to tell? What will this do to our tank if it's not cured? We have 5 damsels in there right now that have been cycling our tank for the last month.