Use kalk paste,take the rocks out and swap them with a LFS,use aiptasia x, take the rocks out and cut them off the rock and trade/sell. Nothing eats them so you dont have any choices there
click on "go advanced" next to "post quick reply" then scroll down to manage attachments.. After that a box will pop up click on choose file. (select the file you want). once it is uploaded click on upload close that screen and you should just be able to then click on post quick reply. I use photobucket and just copy and paste the
Offer them for cheap or just take the rocks out and chisel off a half inch deep from each area that they are on. Or take the rock out and let it dry. Then take a steel brush to get off as much as possible and then cure the rock.