The rocks were in RO for several days. Then I removed the rock and RO from the tank, filled the tank with water and crud from a water change. The crud will be teeming with bacteria and the rock should cure quicker with the crud than without it.
Really, I wasn't that concerned about preserving bacteria. I mean, if bacteria survived, then maybe the snail killer might have survived too
When in doubt when dealing with one of those worms, KILL EVERYTHING
