Boil the driftwood, then soak it to remove tannins and kill bacteria

The fastest way to clean driftwood is to boil it for 15 to 20 minutes, then soak it in fresh water for several days while changing the water daily. Boiling kills surface bacteria and parasites that could harm fish. Soaking removes tannins — the compounds that turn water brown — which some aquarists want to reduce before adding the wood to the tank.

If the driftwood is very large or your pot is small, you can soak it without boiling first. Soaking alone takes longer (usually one to two weeks of daily water changes) but works if you are patient. Boiling speeds the process and is safer if the wood came from an unknown source or sat outdoors for a long time.

After boiling or soaking, rinse the driftwood under running water and scrub it with a stiff brush to remove any loose bark, algae, or debris. Let it dry completely before placing it in the aquarium, or submerge it when ready if you prefer — both are fine.

Key Takeaways

  • Boiling driftwood for 15 to 20 minutes kills bacteria and parasites faster than soaking alone.
  • Soaking in fresh water for several days removes tannins that discolor the aquarium water; change the water daily until it runs clear.
  • Scrub the wood with a stiff brush after boiling or soaking to remove loose bark, algae, and debris.
  • Driftwood can go into the tank wet or dry — both are safe once the wood has been cleaned.
  • Wood from unknown sources or outdoor locations should be boiled rather than soaked alone to reduce the risk of introducing unwanted organisms.

Why boiling matters more for some driftwood than others

Boiling is most important if you found the driftwood outdoors, bought it from a pet store without knowing its history, or suspect it may have been exposed to pesticides or pollutants. Boiling kills most bacteria, fungi, and parasites on the surface. It also helps the wood absorb water faster, which makes it sink more reliably instead of floating for weeks.

If you bought the driftwood from a reputable aquarium supplier and it was stored indoors, soaking alone is usually safe. Many aquarists skip boiling for commercially prepared driftwood and go straight to soaking. The choice depends on how much you trust the source and how much time you have.

The daily soaking routine and when the water stops turning brown

Place the driftwood in a large bucket or container and cover it with fresh water. After 24 hours, drain the water — it will likely be brown or tan from the tannins. Refill with fresh water and repeat daily. Most driftwood stops releasing tannins noticeably after five to ten days, though some pieces continue for two weeks or longer.

You can stop soaking when the water stays clear or nearly clear after 24 hours. At that point, tannin release has slowed enough that it will not significantly discolor your aquarium. Some aquarists continue soaking for a few extra days to be thorough, but it is not required.

If you are in a hurry and do not want to wait for the water to clear completely, you can add the driftwood to the tank after boiling and a few days of soaking. The remaining tannins will continue to leach into the tank water slowly, but many fish and plants tolerate slightly tinted water without issue.

Scrubbing and removing loose bark safely

After boiling or soaking, use a stiff-bristled brush — a old toothbrush, vegetable brush, or aquarium-specific brush works well — to scrub the entire surface of the wood. Pay special attention to crevices, cracks, and areas where bark is peeling. Loose bark can break apart in the tank and cloud the water or clog your filter.

Scrub gently enough that you do not damage the wood itself, but firmly enough to remove anything that flakes away easily. If bark is stuck tight, leave it alone — it is not a problem. Only remove what comes off with light pressure.

Rinse the wood thoroughly under running water after scrubbing to wash away all the debris and loose particles. If you boiled the wood, let it cool before scrubbing to avoid burns.

Dealing with driftwood that floats or sinks too slowly

Freshly boiled driftwood often floats because air is trapped inside the wood. Soaking helps it absorb water and sink, but some pieces remain buoyant for weeks. If you want the wood to stay in place when ready, you can weight it down with a rock, tie it to a plant weight with fishing line, or anchor it to a piece of slate using aquarium-safe epoxy.

Alternatively, you can submerge the wood under a heavy object in a bucket of water for a few days after boiling to force it to absorb water faster. This speeds up the sinking process without requiring permanent anchoring in the tank.

If you do not mind waiting, the wood will eventually sink on its own as it continues to absorb water over weeks or months. There is no rush — floating driftwood is not harmful, just inconvenient.

What to do if the driftwood has visible mold or algae

If you see white fuzz (mold) or green or brown film (algae) on the driftwood before or after boiling, scrub it off with a brush under running water. Boiling will kill most mold and algae, so a second boil is not necessary unless the growth is heavy.

Do not use bleach or other chemicals to clean aquarium driftwood, even if you rinse it thoroughly afterward. Residue can harm fish and plants. Boiling and scrubbing are the only safe methods for aquarium use.

Mold and algae on driftwood in the tank are normal and harmless — they will appear over time as the wood becomes part of the aquarium ecosystem. Cleaning the wood before it goes in the tank reduces the initial load, but some growth is inevitable and beneficial for the tank.

Drying versus submerging: which is better

You do not have to dry driftwood before adding it to the tank. Many aquarists place the wood in the tank while it is still wet from soaking or rinsing. Wet wood sinks faster and is ready to use when ready.

If you prefer to dry the wood, lay it on a clean surface in a warm, well-ventilated area for a few days. Dried wood will float longer when first submerged, but it is not damaged by drying. The choice is purely about convenience and how soon you want to set up the tank.

Frequently Asked Questions

How long should I boil driftwood?

Boil for 15 to 20 minutes. This is long enough to kill most surface bacteria and parasites without damaging the wood. Very large pieces may need 20 to 30 minutes, but boiling longer than 30 minutes is unnecessary.

Can I use driftwood from the beach or river without cleaning it?

No. Outdoor driftwood may carry bacteria, parasites, or chemical residue. Always boil it for at least 15 minutes and soak it for several days before adding it to the tank. This reduces the risk of introducing harmful organisms to your aquarium.

Will tannins hurt my fish?

No. Tannins are not toxic to fish. They straightforward turn the water brown or tea-colored. Many aquarists reduce tannins by soaking because they prefer clear water, but fish tolerate tinted water without issue. Some planted tanks and blackwater setups intentionally keep tannins in the water.

What if my driftwood still floats after soaking?

Weight it down with a rock, tie it to a plant weight, or anchor it with aquarium epoxy. You can also submerge it under a heavy object in a bucket for a few more days to force faster water absorption. Eventually, all driftwood sinks as it absorbs water over time.

Do I need to boil driftwood from an aquarium store?

Boiling is optional for commercially prepared driftwood stored indoors. Many aquarists soak it without boiling and have no problems. Boil it if you want extra assurance or if the wood floats and you want it to sink faster.