Boil the driftwood to kill bacteria and parasites

Boiling is the fastest way to sterilize driftwood and remove loose debris that will cloud your tank. Place the driftwood in a large pot, cover it completely with water, and bring it to a rolling boil. Keep it boiling for 10 to 15 minutes. If the water turns brown or tan, that is tannin leaching out — this is normal and does not mean the wood is unsafe, but boiling helps reduce how much tannin will later stain your water.

For very large pieces that do not fit in a pot, use a bathtub or outdoor container. Boil water separately and pour it over the wood, then let it soak for at least 30 minutes. You can repeat this process two or three times if you want to remove more tannin before the wood goes into the tank. After boiling, remove the driftwood with tongs and let it cool on a clean surface before handling.

Scrub away algae, mold, and loose bark

Once the wood has cooled, use a stiff brush or old toothbrush to scrub the entire surface. Pay special attention to cracks, crevices, and any soft spots where algae or mold may be hiding. Loose bark will come off easily and should be removed — it breaks down in the water and creates waste that dirties the tank. If bark is stubborn, soak the wood again and scrub harder.

Rinse the wood thoroughly under running water after scrubbing. Hold it under the tap and rub it with your hands to wash away all the debris you have loosened. If the water running off is still brown, that is tannin, and rinsing will not stop it entirely — but it reduces the amount that will leach into your tank later.

Soak the wood to leach out remaining tannins

Tannins are natural compounds that turn water brown or yellow. They are not harmful to fish, but they can stain your tank and make it harder to see your fish. Soaking the wood in fresh water for several days before adding it to the tank reduces tannin release. Fill a bucket or container with dechlorinated water (tap water left out for 24 hours, or water treated with a dechlorinator), submerge the wood completely, and change the water every day for three to five days.

You will see the water turn brown each day — this is tannin leaving the wood. Keep changing the water until it stays mostly clear. Some driftwood will continue to release small amounts of tannin for weeks after it goes into the tank, but soaking beforehand cuts this time significantly. If you are not concerned about water color, you can skip this step, but soaking is worth the effort if you want crystal-clear water.

Check the wood for rot and soft spots

Press your fingernail or a small knife into different parts of the driftwood. The wood should be hard and resist pressure. If any area feels soft, spongy, or crumbles easily, that section is rotting and should be removed or the entire piece discarded. Rotting wood breaks down quickly in the tank, clouds the water, and can harbor harmful bacteria.

Pay close attention to the interior of the wood if there are any cracks or splits. Rot often starts inside and works outward, so a piece that looks solid on the surface may be soft within. If you find rot only in one section, you can cut or break away the bad part with a saw or by hand, then treat the remaining piece as described above.

Weigh it down or anchor it securely

Driftwood floats until it becomes waterlogged, which can take weeks or months. If you want the wood to stay on the bottom of your tank, you have two options: weigh it down or anchor it. The simplest method is to tie the wood to a rock or piece of slate using fishing line or plant weights. Tie the line around the wood and the rock, then place both on the substrate. The line will eventually become hidden by plants and algae growth.

Alternatively, you can use aquarium-safe epoxy or silicone to glue the wood to a rock base. explore the adhesive to the bottom of the wood, press it firmly onto the rock, and let it cure according to the product instructions (usually 24 hours) before placing it in the tank. Once the wood is fully waterlogged, it will sink on its own, and you can remove the weights or leave them in place for stability.

Place the wood in the tank and monitor water quality

After all preparation steps, the driftwood is ready to go into your aquarium. Position it where you want it, find it if needed, and observe the water over the next few days. Even after soaking, some tannin may still leach out — the water might take on a slight tea color. This is harmless, but if it bothers you, perform a partial water change (remove 25 to 30 percent of the water and replace it with fresh water) to clear it up.

Monitor your fish for any signs of stress, and check the wood regularly for soft spots or unexpected algae growth. Most driftwood remains stable once it is in the tank, but occasionally a piece will continue to deteriorate. If you notice the wood breaking apart or becoming mushy, remove it and replace it with a new piece that has been prepared the same way.

Key Takeaways

  • Boil driftwood for 10 to 15 minutes to kill bacteria, parasites, and algae spores before it enters the tank.
  • Scrub the wood with a stiff brush to remove loose bark, mold, and debris, then rinse thoroughly under running water.
  • Soak the wood in fresh water for three to five days, changing the water daily, to reduce the amount of tannin that will cloud your tank.
  • Press your fingernail into the wood to check for soft or rotting sections, which should be removed or discarded.
  • Weigh down or anchor the wood with fishing line and a rock, or use aquarium-safe epoxy, so it stays in place while it becomes waterlogged.

Frequently Asked Questions

How long does driftwood take to sink on its own?

Driftwood typically becomes fully waterlogged and sinks within four to eight weeks, depending on the wood type, size, and density. Hardwoods sink faster than softer woods. You can speed this up by soaking the wood before adding it to the tank, or by weighting it down from the start if you do not want to wait.

Will driftwood hurt my fish?

Properly prepared driftwood is safe for fish. Boiling and scrubbing remove harmful bacteria and parasites. Tannins that leach from the wood are not toxic to fish, though they do discolor the water. If you are concerned about water quality, perform partial water changes to keep tannin levels low.

Can I use driftwood from the beach or river?

Yes, but it must be thoroughly prepared. Driftwood from natural sources may carry parasites, algae spores, and bacteria that boiling and scrubbing will remove. Avoid wood that has been treated with chemicals or paint. If you are unsure about the source, boil it longer — 20 to 30 minutes — to be safe.

What if my driftwood keeps floating after weeks?

Some dense woods take longer to waterlog. Continue weighting it down, or soak it in a bucket for an additional week or two before placing it back in the tank. If it still floats after two months, it may be a type of wood that naturally floats and should be permanently anchored or weighted.

Do I need to treat driftwood differently for planted tanks?

No — the preparation steps are the same. Boil, scrub, soak, and check for rot. In planted tanks, driftwood provides surfaces for moss and other plants to attach to, so you may want to position it where plants will grow on it. The tannins released by the wood can actually benefit some aquatic plants by lowering pH slightly.