How to Prepare Driftwood for Aquarium? | Scrub, Boil, Soak, Sink

If you’ve ever watched a prized piece of driftwood float stubbornly to the top of a new tank, you know rinsing alone won’t cut it. Knowing how to prepare driftwood for aquarium setup is the difference between a piece that clouds your water for weeks and one that settles in as a stable, safe centerpiece from day one. The full sequence — inspect, scrub, boil, soak — removes tannins, kills hitchhikers, and waterlogs the wood so it stays where you put it.

Preparing Driftwood for Your Aquarium: The Reason for Every Step

Raw driftwood carries more than you want in a tank. Loose bark rots and fouls the water. Surface dirt feeds algae before your plants get established. Tannins — the natural compounds that leach out as a brown tea — are harmless to fish but can darken the water far more than most aquascapers prefer. And until the wood is fully saturated, it floats.

Each prep step targets one of these problems. Scrubbing removes surface gunk and loose material. Boiling speeds up tannin release and sanitizes the wood — The long soak finishes the job, pulling tannins out and letting water replace the air inside the wood grain so it sinks on its own. Skipping or shortening any of these steps is the most common reason driftwood causes trouble after it’s in the tank.

The Steps That Get Driftwood Tank-Ready

Start with dry wood that shows no signs of mold, rot, or fungus. Inspect every crack and crevice for insects or debris, then trim any sharp edges or loose bark. If you’re still shopping for a piece you can prep easily, our roundup of the best driftwood for aquarium setups covers shapes and sizes that work well with standard preparation methods.

Scrub thoroughly. Use a stiff brush under running water to remove dirt, loose bark, and any surface residue. Pay extra attention to crevices where debris hides. No soap or chemical cleansers — driftwood is porous and will absorb them, then slowly release them into your tank water.

Boil if the piece fits. Boiling for 1 to 2 hours speeds up tannin release and sanitizes the wood. If your piece is too large for any pot you own, pour boiling water over it repeatedly, or run 30‑minute boil cycles in a large stockpot, changing the water each time until it stays mostly clear. The boiling step is optional but recommended for the fastest results and the most thorough sanitation.

Soak with frequent water changes. Submerge the wood fully in dechlorinated water or RO water. Change the water every 1 to 3 days — daily changes pull tannins out fastest. The soak continues until the wood sinks on its own and the water stays clear or only lightly tinted after several changes.

Test before you commit. Place the soaked wood in a bucket of clean water for 24 hours. If it stays submerged and the water doesn’t turn dark, it’s ready for your tank. If it still floats or the water darkens noticeably, continue soaking with more frequent water changes.

How Long Before the Wood Stays Down and the Water Runs Clear?

The timeline varies with the wood’s size, density, and tannin content. A small piece of well‑boiled mopani wood might be ready in a week. A large chunk of thick driftwood can take three to four weeks of patient soaking.

The only reliable test is the wood’s own behavior: it sinks without help, and the soak water stays clear after a few days without a change. Replace the water every day or two until those two conditions are met. If you need the wood in the tank before it’s fully waterlogged, weigh it down with aquarium‑safe rocks or stainless steel weights — it will continue absorbing water and sink on its own over the following weeks.

Tannins that leach into the tank are normal and harmless. Many fish species actually prefer the darker, more natural water. If the tint bothers you, add activated carbon to your filter and it will clear within a few days.