If you use bleach, mix it at 25% bleach in a bucket for a few hours, then rinse it off well, and leave it in a bucket of just water for a few more hours to get the bleach off.
Better, just use vinegar in a bucket and leave the rock in there for a few hours, rinse then you can just throw it back in the tank.
Hi, I was looking at the rock with a flashlight and i see 3 bristleworms maybe there are a lot more in the holes, if I use vinegar it will kill them? How many hours should I let it in vinegar and then in water, and do I use vinegar mixed with water or only vinegar? Thanks for the responds.