Put them in a large tub of water and add maybe a cup of bleach. Let it sit for 24 hours. Drain, refill and add a double dose of dechlor. Let it sit for another 24 hours. Drain rinse and let them dry off. Between the dehclor and the drying off, there is no risk of residual chlorine. This will kill off any snail eggs, etc. I introduced snails by only scrubbing creek rocks years ago and still have them in my tanks. See Suitabillity of Rocks in the forum library. Lots of myths out there about what's safe and what's not.Baustin12017 said:i was just wondering if i could get rocks from a stream to put in my aquarium and if so how do i clean them to make them safe.