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How to Prepare Driftwood for Aquarium
Tank Care

How to Prepare Driftwood for an Aquarium So It Sinks, Stays Clean, and Doesn't Stain Your Tank

Learn how to prepare driftwood for an aquarium: pick safe wood, boil or soak it until it sinks, and deal with tea-colored water.

Jack·6 min read·May 21, 2021·Updated October 13, 2026

You set a new piece of driftwood in the tank, and within minutes it floats up to the surface. By the next morning the water has turned the color of weak tea. Both problems come from skipping preparation. To prepare driftwood for an aquarium, start with a safe hardwood and scrub it with plain water. Then boil it for an hour or two, or soak it in a bucket for weeks with regular water changes, until it sinks on its own. Any tint left after that is harmless.

Start With the Right Piece of Wood

Preparation can't fix the wrong wood, so choose carefully. Hobbyist guides say to avoid softwoods and conifers such as cedar, pine, cypress and yew, because their sap, resin and oils leach into the water. A quick check is to press a fingernail into the wood. If it digs in easily, you're probably holding softwood.

The main hazard is wood that still holds sap. A common rule of thumb is that dead, dry wood with no sap smell is fine. Grapevine wood is often flagged as prone to growing mold underwater. Hobbyists commonly use oak, ash and fruit woods.

Most aquarium driftwood sold in stores is one of four types: Malaysian driftwood, savanna root, manzanita or mopani. Manzanita is known for releasing fewer tannins than most. Even so, a store label doesn't guarantee a piece is clean, so prepare store-bought wood the same way you would a piece you found yourself.

Cedar has a bad reputation with pet owners, but most of that concern comes from small mammals housed on cedar or pine shavings. Reports describe airway irritation from the wood's phenols and liver-enzyme changes in rodents. Some keepers argue those findings get repeated more than they deserve. For a fish tank, the simpler reason to skip cedar is its oils.

If You Collect It Yourself, Check Two Things First

Is it legal to take? Rules depend on who manages the beach. Oregon's state park rules allow driftwood removal for personal ornamental use, limited to wood "which can be loaded by hand only." Wood embedded in the beach or in dune banks can't be taken at all. Humboldt County, California, bans taking wood from its county parks except for limited collection on its ocean beach parks, so check the county's rules before you load up.

Many California state park beaches don't allow collecting, and the rules differ from park to park. Michigan's rules for state land appear to bar removing dead and downed woody debris, so read the current rule before you collect there. In a national park, check that park's Compendium. Everywhere else, ask the agency that manages the beach.

Could it carry pests? Insects can live inside wood or on its surface. USDA's plant health agency, APHIS, warns that moving wood even a short distance can spread emerald ash borer and other invasive pests. It also asks people to obey federal and state quarantines. Don't carry wild wood out of the area where you found it. The heat treatment described below is a good reason to boil any piece you collect.

Wood from the ocean has also soaked in seawater. Extra rinsing and soaking before it goes into a freshwater tank is a sensible precaution.

Scrub It With Plain Water

Rinse the wood and scrub off dirt, loose bark, soft rotten spots and packing dust with a stiff brush. Most hobbyists skip soap, because residue can soak into porous wood and later leach into the tank. That advice is common practice rather than a tested rule, but it costs nothing to follow.

At least one guide suggests about 2 tablespoons of bleach per gallon of water to kill microbes, followed by very thorough rinsing. Plain water and heat do the job without the risk of leftover chlorine, so they are the safer choice.

Boil It, Soak It, or Do Both

This step solves both opening problems: wood that floats and wood that tints the water.

Boiling is the most common method. Guides recommend 1 to 2 hours to sterilize the wood. Some allow up to 4 hours for smaller pieces. Heat drives water into the wood faster and pulls tannins out sooner. It also kills most hitchhiking organisms and insects. Change the water if it turns dark, and repeat the boil if the wood still floats.

Soaking works for pieces too big for a pot. Put the wood in a bucket, storage tub or bathtub, weigh it down if needed, and change the water regularly. Expect 1 to 4 weeks. Very tannin-heavy wood can keep tinting the water for months.

You don't have to soak before you boil. Many keepers boil small pieces and skip soaking entirely. Large pieces get a long soak, sometimes with hot water poured in to speed things up. The wood is ready when it sinks on its own and the water around it stays fairly clear.

Understand the Tea-Colored Water

The brown tint comes from tannins, and tannins don't harm fish. Many species come from tannin-rich "blackwater" streams and do well in it. Tannins do stain the water yellow-brown and lower its pH, so keep an eye on pH if your fish need harder, more alkaline water.

If the tint bothers you after the wood is in the tank, add activated carbon to your filter. It removes the staining. Regular water changes also fade it over time.

What to Expect Once It's in the Tank

Adding the wood during a regular water change keeps the disturbance to a single session. Within the first few weeks, you may see white, cottony fuzz on the wood. This is a fungal growth and is usually harmless and temporary. It typically disappears within weeks. Shrimp and snails graze on it, and you can vacuum it off in the meantime.

Driftwood breaks down slowly underwater, and how long it lasts depends on the species and density of the wood. There's no fixed replacement schedule. Remove or replace a piece when it turns soft, starts to crumble, or fouls the water.

Quick Checklist

  1. Choose dead, dry hardwood or a common aquarium wood, and skip softwoods and anything that smells of sap.
  2. If you collect it, confirm it's legal to take and keep it in the local area.
  3. Scrub with a brush and plain water.
  4. Boil for 1–2 hours, or soak for 1–4 weeks with regular water changes.
  5. Add it once it sinks, and use activated carbon if the tint bothers you.
  6. Expect harmless white fuzz for a few weeks, and replace the wood when it softens or crumbles.
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