The vinegar drop on rocks is true and worth it.Wait wait wait... You also collect your own wood and rocks for tanks?
The elm root is really nice, and would make an awesome underwater 'tree' if you glued java moss to it...
I've so badly wanted to take wood and stones from nature and use them to scape. I'm getting into aquascaping, but driftwood and hardscape is soooo expensive at my LFS and online, which has really held me back. I've seen awesome branches and things that would look incredible, and I did look into how to make sure it was aquarium safe, but sources were torn on whether it was really safe or not, saying that some organisms or eggs might be able to survive boiling! And that bleaching wood could be dangerous too, since some woods could soak up the bleach into tiny crevices, and then leach out into your tank. Also different methods suggested to test whether a stone is inert or not, and that testing it by dropping vinegar I think it was not reliable.
So I chickened out.
Please please share how you do this! Do you need to identify what kind of tree the wood came from? Or what type of rock it is? How do you make a piece aquarium safe, just by boiling? My gut tells me that boiling it would be enough, and it would be incredibly rare and unlucky for anything to survive several boilings.
I'll bake wood or boil it, i prefer to grab what's already dried out when it comes to wood, instead of any sitting in water. Ive never had any nasties introduced from driftwood, aside from bryozoa that can survive boiling potentially, but they are 1000% harmless to your tank and can actually be beneficial if anything.
I bake any pieces too large to boil. But I never bleach driftwood. Too porous to risk.
Do not collect grapevine, pines, cedars, spruce, or any wood that produces a white sap. Make sure it is dried out and aged. Fresh branches will rot.
Some safe bets are oak, beech, birch, magnolia, and elm. I personally love elm because young shrubs of it have fun shapes and they grow along rocky shorelines where i live, so they get washed up as driftwood often.