Plecos need real wood in the tank, not plastic imitation, because for many of these catfish the wood itself is part of the diet and part of the furniture. The practical question is which wood, and the answer is dense aquarium driftwood chosen by material, prepared before it goes in, and placed where the fish can both graze it and hide against it. Get the material right and a pleco will spend contented hours rasping a surface that slowly feeds it; get it wrong, with soft, resinous, or treated timber, and the wood can foul the water it was meant to enrich.
The Woods to Choose
Bogwood is the classic choice: dark, dense, and heavy, it sinks readily once waterlogged and offers a broad rasping surface that lasts for years. Mopani is another sound option, strikingly grained, very hard, and slow to break down, though its density means it releases tannins generously at first and needs patient preparation. Malaysian driftwood, sold in twisted, branching pieces, gives a pleco varied surfaces and natural shelter in one piece, and its shapes suit smaller tanks where a single chunk of bogwood would dominate. Choose by the tank: a piece large enough to graze across and rest beside, with no sharp points that could scrape a soft belly.
Why Plecos Rasp on Wood
Watch a pleco after lights-out and the wood's role becomes obvious. The fish clamps its mouth to the surface and rasps steadily, taking in fine wood fiber along with the biofilm growing on the surface, and many pleco species appear to need that fiber moving through the gut for healthy digestion. Wood is also shelter: a pleco tucked under or behind a solid piece during the day feels hidden from view, and a fish with a secure daytime refuge feeds more confidently at night. Keep the wood accessible rather than scrubbing it clean at every water change, since the softened surface layer and its growth are exactly what the fish is harvesting. A pleco with no wood may rasp at other surfaces and fare worse over time, which is why wood belongs on the setup list from the first day rather than as a later decoration.
Prepare New Wood Before It Goes In
New driftwood rarely sinks and rarely arrives clean, so preparation comes first. Soak the piece in a bucket of plain water, changing the water as it darkens, until the wood stays down on its own; dense mopani can take patience, while bogwood often waterlogs faster. Boiling the piece, where its size allows, speeds the same job: it waterlogs the wood and draws out much of the tannin that would otherwise tint the tank water tea-brown for weeks. Rinse the cooled wood, let it cool fully before it enters the tank, and anchor any still-buoyant end under a rock rather than forcing it. Once placed, expect the surface to soften and grow a pale film in the first weeks; that film is normal, and the pleco will graze much of it away.
Woods to Avoid
Not every attractive piece of wood belongs underwater with fish. Avoid softwoods such as pine and cedar, whose resins can leach into the water and irritate or harm the tank's inhabitants. Avoid gathered wood of unknown history, including branches picked up near roadsides, where sprays, oils, and road runoff may have soaked deep into the grain, and avoid any treated, painted, or preserved timber, since the chemicals that protect it outdoors are exactly what you do not want dissolving in a closed tank. Grapevine and other decorative land woods sold for dry enclosures also break down quickly underwater and can rot rather than endure. When the origin of a piece is uncertain, the safe decision is to leave it out and choose a known aquarium hardwood instead, because a pleco will spend years with its mouth on whatever you provide.
Written down once in KinsLe, Family Sharing keeps the tank's wood type, preparation notes, and placement visible to everyone who helps with the aquarium.