Discus aquarium décor: driftwood, rocks and catappa leaves

In short

• Recommended driftwood: Mopani (heavy, sinks naturally), Spider wood (decorative), Mangrove root (premium). Don't use unidentified forest wood.
• Rocks safe for discus: Seiryu Stone (test it for KH/pH), Dragon Stone (Ohko), black lava rock, slate. Avoid limestone rocks.
• Catappa (Indian Almond) leaves: ~1 leaf per 30 L (~8 US gal); they release tannins that lower pH and are a natural antibacterial. Replace every 3–4 weeks.
• Mandatory prep: driftwood needs boiling for 30–60 min + soaking for 1–7 days. Rocks need a vinegar acid test for limestone.
• Real function: hiding spots for the discus hierarchy, support for epiphytes (Anubias, Microsorum), natural water acidity.
• Tea-colored water from tannins is normal and beneficial for discus — not a defect.

💱 The décor choices apply everywhere. Prices vary a lot by country, so we don't publish fixed international prices. Where a Romania figure appears (starter-setup budget), it's clearly labelled as a Romania estimate.

What you'll learn

Hardscape (the "hard" décor — wood and rocks) is the visual and functional foundation of a discus tank (Symphysodon). More than aesthetics, the right hardscape provides hiding spots for the natural hierarchy, support for epiphytes, acidifies the water through tannins and recreates the Amazonian biotope. This guide shows you which types of driftwood and rocks are safe for discus, how to prepare them correctly (boiling, soaking, the acid test), how to place them, and which mistakes to avoid.

Driftwood — types and characteristics

Mopani Wood ⭐ recommended for beginners

• The most accessible and reliable — sinks immediately, no floating issues
• Releases lots of tannins — colors the water a "tea color" and lowers pH naturally (great for discus)
• Available in most aquarium stores
• An excellent support for Anubias, Microsorum, Bucephalandra

Spider Wood

• The most decorative — striking branched shapes
• ❌ Floats for 1–4 weeks → anchor with rocks or a bolt under the substrate
• Releases tannins moderately
• A premium pick for modern aquascapes

Don't use

• ❌ Unidentified forest wood (toxic resins — pine, spruce)
• ❌ Fresh green wood (releases sap)
• ❌ Rotting wood with fungi
• ❌ Lacquered or chemically treated wood

Rocks — safe for the acidic pH discus prefer

Discus prefer water with pH 6.0–6.8. Many rocks popular in aquascaping (limestone-based) raise pH → incompatible.

Limestone test (mandatory before buying)

Drip household vinegar or lemon juice on the rock:

• ✅ No reaction = a rock safe for discus
• ❌ Foams / bubbles = it contains limestone and will raise pH and KH

Rocks safe for a discus tank

Rocks to AVOID

⚠️ Seiryu Stone is popular in aquascaping, but it sometimes contains limestone. Test it well with vinegar before putting it in the tank.

Catappa leaves (Indian Almond Leaves) — a must-have

Leaves of Terminalia catappa are almost essential for an authentic discus tank.

Benefits

• ✅ Release tannins → lower pH to ~6.0–6.5 naturally
• ✅ A natural antibacterial and antifungal (flavonoids)
• ✅ Reduce stress in discus (recreate the natural Rio Negro habitat)
• ✅ Encourage breeding — discus pairs often lay eggs on leaves
• ✅ Discus fry and shrimp feed on the biofilm of decomposing leaves

How to use

Procedure: rinse the leaf, let it sink over 1–2 days (or anchor it under a rock). Let it decompose naturally in the tank — the biofilm is natural food. For a full blackwater effect, combine the leaves with peat and alder cones.

Natural alternatives

• Dried oak leaves — release tannins, milder than catappa
• Dried beech leaves — similar
• Alder cones — release tannins strongly, pH drops quickly

⚠️ Collect leaves only from uncontaminated areas (away from roads, pesticides). Wash well and dry for 2 weeks.

Driftwood prep — step by step

Step 1: Mechanical cleaning

• Scrub with a stiff brush to remove dust, fungi, old biofilm
• Rinse under cold running water

Step 2: Boiling (strongly recommended)

• Put the wood in a large pot of water, bring to a boil
• Boil for 30–60 minutes (this reduces about 70% of the tannins and kills any bacteria and parasite eggs)
• Change the water 2–3 times if it colors strongly
• ⚠️ Very large wood that won't fit in a pot: pour boiling water over it or use the brine method

Step 3: Soaking

• Put the wood in a bucket of cold water
• 1–7 days of soaking (until it sinks on its own, without anchoring)
• Change the water daily — you'll see it color less and less
• Heavy woods (Mopani, Mangrove) — 1–2 days is enough
• Spider wood — 5–14 days, or permanent anchoring

Step 4: Into the tank

• Place it in its final position
• The water will turn "tea color" for 2–8 weeks — this is NORMAL and beneficial for discus
• Water changes will gradually reduce the color (if you want clear water)

Hardscape placement — design rules

The Rule of Thirds

• Mentally divide the tank into 3 horizontal zones
• Don't place the central piece exactly in the middle — place it at 1/3 left or right
• Create a natural asymmetry

Three popular styles for discus

1. Amazonian biotope (natural)

• Vertical driftwood (roots)
• Catappa leaves on the substrate
• Plants: only Echinodorus + floating plants
• Substrate: fine sand

2. Iwagumi-influenced (rock accent)

• 3–5 Seiryu/Dragon Stones arranged asymmetrically
• Background plants (Anubias, Microsorum on rocks)
• Minimalist, focused on the rocks

3. Planted jungle

• A large driftwood + dense plants
• Anubias and Microsorum attached to the wood
• Tall plants (Vallisneria) as a backdrop

Functional rules (for discus)

Common hardscape mistakes

❌ "I'll put the wood straight in the tank, no boiling" — risk: bacteria, parasite eggs, contamination. Plus it colors the water strongly for months.

❌ "I'll buy Seiryu Stone without testing it with vinegar" — many Seiryu batches contain limestone. It raises KH → pH 7.5+ → chronically stressed discus.

❌ "I'll use wood from the local riverbank with no prep" — a risk of pesticides, rotting wood, fungi. Only if you clearly identify the species (willow, birch — safe if dried for 6 months).

❌ "The water turned brown from tannins, I'll change it all" — brown ("tea colored") water is EXACTLY what you want for discus. It acidifies naturally, is antibacterial and recreates the Amazon. Only change it if you want crystal-clear water for aesthetics.

❌ "I added 20 catappa leaves at once to brown the water fast" — an overdose → pH drops suddenly → stressed discus. Add gradually, 1–2 leaves/week.

❌ "I'll add coral, it's pretty" — coral raises pH to 8+. Completely incompatible with discus. For African cichlid or marine tanks.

❌ "The driftwood floats, I'll hold it down with a rock for 1 day" — Spider wood floats for weeks. Anchor it with a stainless bolt under the substrate or with aquarium-safe super-glue gel on a heavy rock.

❌ "I'll add lots of hardscape so it looks full" — an over-decorated tank = less swimming space, harder to clean, and dead zones where waste accumulates.

Hardscape + epiphytes — a recommended combo

A minimum viable setup for discus (200–250 L / ~53–66 US gal):

Final checklist — décor and hardscape

• ☐ Driftwood chosen: Mopani or Mangrove (the safest)
• ☐ Rocks tested with household vinegar (no bubbles = safe)
• ☐ Wood boiled 30–60 min + soaked 1–7 days before the tank
• ☐ Catappa leaves acquired (~1 leaf per 30 L / 8 US gal)
• ☐ Placement using the Rule of Thirds (asymmetric, not centered)
• ☐ Hiding spots at 2–3 levels for the discus hierarchy
• ☐ 30–40% open surface for swimming
• ☐ No sharp rocks (they injure the discus slime coat)
• ☐ Anubias/Microsorum attached to driftwood (tied with thread)
• ☐ Accept "tea colored" water — it's beneficial, not a defect

What to do next

📚 Learn more: Amazonian biotope for discus — how to recreate the natural Rio Negro habitat.

🧮 Calculate: Aquarium volume calculator — how much hardscape fits your volume.

🛒 Buy: See the whole Discus.ro shop — accessories, water treatment, lighting and more for your setup.