Spider Wood | Natural Wood for Fish Aquariums & Tanks

Spider wood is the most popular natural wood for fish aquariums — its fine, irregular branching creates focal points no other wood type replicates. Available in different sizes with a ready-planted option for instant results.


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FAQs

What is spider wood for aquariums?

Spider wood is a natural wood for fish aquariums made from Rhododendron root, widely used in aquascaping for its distinctive fine, branching structure. It replicates submerged tropical wood found in river habitats, provides attachment points for moss and epiphyte plants like Anubias and Java Fern, and creates natural shelter for fish. Available in sizes from small 15cm branches up to XL pieces over 50cm.

Does spider wood need to be treated before going in a fish tank?

Yes — soak spider wood in a bucket of water for 24–48 hours before placing it in your fish tank. Spider wood releases tannins which tint the water amber and slightly lower pH. Pre-soaking reduces this significantly. Boiling smaller pieces for 30–60 minutes also helps waterlog the wood so it sinks faster and sterilises the surface. Tannin release reduces naturally over time as the wood seasons in the aquarium.

Will spider wood sink in my aquarium?

Spider wood is lightweight and may float initially. Soak it in a bucket for 24–48 hours to help it absorb water and sink. For quicker results, boil smaller pieces for 30–60 minutes. You can also weigh it down temporarily with a rock or attach it to a base using aquarium-safe super glue gel until it becomes fully waterlogged.

What plants can I attach to spider wood in an aquarium?

Spider wood is ideal for epiphyte plants that grow on surfaces rather than rooting into substrate. Anubias, Java Fern, and Bucephalandra attach naturally using their rhizome — tie loosely with cotton thread or use aquarium-safe super glue gel. Aquarium mosses such as Java moss and weeping moss can also be tied directly to spider wood branches and will spread across the surface over time.

How do I choose the right size spider wood for my fish tank?

Choose a spider wood piece that spans roughly two-thirds of your tank's width. For tanks up to 60cm, Small (20–30cm) or Medium (30–40cm) works well. For 80–100cm tanks, choose Large (40–50cm) or XL (50–60cm). Spider wood branches (15–25cm) suit nano aquariums and shrimp tanks, or can be layered with larger pieces to build a more complex layout.

Why spider wood is the go-to wood for fish aquariums

Spider wood (Rhododendron root) has become the defining hardscape material in the planted tank hobby. Its branching, root-like structure replicates submerged tropical wood found in river habitats — the environment tetras, rasboras, and dwarf cichlids naturally inhabit. No two pieces are identical, making every spider wood aquarium layout genuinely unique. The fine branches also provide ideal attachment points for Java moss, Anubias, and Bucephalandra, which root onto the surface without any substrate needed. In a fish tank, spider wood adds visual structure and creates natural shelter — fish instinctively use branching wood as cover, reducing stress and encouraging more natural behaviour.

Choosing the right size spider wood for your fish tank

As a general guide, the main piece should span roughly two-thirds of your tank's width. For tanks up to 60cm, Small (20–30cm) or Medium (30–40cm) pieces work well. For 80–100cm tanks, Large (40–50cm) or XL (50–60cm) are better suited. Spider wood branches (15–25cm) are ideal for nano aquariums, shrimp tanks, and layered layouts where multiple smaller pieces build the overall structure.

Complete your spider wood aquarium layout

Spider wood works best as part of a layered hardscape. Pair it with Aquarium Rocks — Seiryu stone and lava rock contrast naturally with spider wood's warm tones and add mid-level structure. For plants pre-attached and ready to place, browse Plants on Wood for Anubias, Java fern, and Bucephalandra already tied to wood pieces. To add moss directly to your spider wood, Aquarium Mosses has Java moss, weeping moss, and Christmas moss ready to attach. For a complete layout with plants, wood, and rock chosen together, our Aquascape Kits take the planning out entirely.

All in-stock orders dispatched same day (Mon–Fri, before 4pm) from our UK facility.

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