I'm going to breaking down my 75g soon and have about 75lbs of completely coraline covered, purple rock. This rock has been in the hobby for years. I'm going to be building up my 120, but will take me a couple of months to get everything. I really don't want to lose the years of growth it has on it. It's about 75lbs total. I know it's a lot to ask, but does anyone have room in their tank to store this? If not, I can always sell it and start over, I just don't want to see it go to waste in a sump.