Yeah, I just did this with hard wood from the woods and I wasn't able to get to cleaning it last fall so it all sat outside through the winter and as soon as weather broke I brought them in an just scrubbed them up with some hot water. I had alot of ants. But it an clean. Then I just put it all in the tank and weighted it down with rocks. My rocks are from outside too. I've had them in my tank for almost a yr. I just bakes my rocks, cooled them down with cold water and put them right in the tank. People say, boil, bake, soak the wood before hand. But, it's not needed. As long are the wood I'd hard wood and dry Imo
, it just needs a good cleaning. A bath tub of hot water, scrub brush, and old toothbrush worked for me. Git-r-done!