Discus aquarium plants: 8 species that handle 29–30 °C (84–86 °F)

In short

• Discus temperatures (28–30 °C / 82–86 °F) rule out about 70% of common tropical aquarium plants.
• Top 4 "set-and-forget" plants for discus: Anubias (any variety), Microsorum pteropus (Java Fern), Echinodorus bleheri (Amazon sword), Cryptocoryne wendtii.
• Plants to avoid: Glossostigma, HC Cuba, Alternanthera, Cabomba, Rotala "macrandra", Ludwigia palustris — all below 26 °C / 79 °F.
• CO₂ is NOT mandatory if you choose low-demand plants (epiphytes + crypts + Vallisneria).
• Moderate lighting: ~0.3–0.5 W/L, 8 hours/day. Excess = brown/green algae.
• Rule of thumb: if the plant's label says a max temperature of 26 °C / 79 °F, don't buy it for a discus tank.

💱 The plant choices apply everywhere. Prices and exact brand availability vary by country, so we don't publish fixed international prices. Where a Romania figure appears (budget), it's clearly labelled as a Romania estimate.

What you'll learn

Plants compatible with discus (Symphysodon) need to meet 3 conditions: tolerate 28–30 °C / 82–86 °F (the biggest challenge — it rules out most "carpet" plants and delicate stems), handle moderate light without CO₂, and not absorb tannins excessively if you want blackwater. This guide shows you 8 proven plants (with care sheets and difficulty), 6 popular plants to avoid, the rules for lighting and CO₂, and how to avoid algae problems.

🔆 A note on light units: aquarists often quote watts per liter (W/L). As a rough guide, 0.3–0.5 W/L ≈ 1.1–1.9 W per US gallon — but modern LED PAR/lumens vary, so treat W/L as a ballpark, not a precise rule.

8 top plants for a discus tank

1. Anubias barteri / nana / coffeefolia ⭐ #1 RECOMMENDATION

Why it's ideal for discus:

• Tolerates 28–32 °C (82–90 °F) without issues
• Grows attached to driftwood or rocks (NOT in the substrate — the rhizome rots)
• Light demand: low → doesn't favor algae
• CO₂ demand: zero
• Discus don't attack it (tough leaves)

Quick care sheet:

Recommended varieties: Anubias barteri "Coffeefolia" (wavy leaves), Anubias nana "Petite" (mini, for the foreground), Anubias gracilis.

2. Microsorum pteropus (Java Fern)

• Same management as Anubias — tie it to driftwood, NOT in the substrate
• Varieties: standard, "Windelov" (fringed leaves), "Trident" (narrow leaves), "Narrow Leaf"
• Light demand: low
• Temperature: 20–30 °C (68–86 °F) (upper limit ~30 °C — watch it above 29 °C / 84 °F)

3. Echinodorus bleheri (Amazon Sword) — the classic background plant

Why it's iconic for an Amazonian biotope:

• Grows large (40–60 cm / ~16–24 in) → the perfect background plant
• Green lance-shaped leaves → a natural Rio Negro look
• Temperature tolerance: 22–30 °C (72–86 °F)
• Needs substrate (won't work on bare-bottom) + root fertilizer tabs

Care sheet:

Compatible varieties: E. bleheri, E. amazonicus, E. parviflorus "Tropica", E. ozelot, E. red rubin.

4. Vallisneria spiralis / americana

• Grows fast and tall (40–80 cm / ~16–32 in) → ideal for vertical cover
• Excellent temperature tolerance (up to 32 °C / 90 °F)
• Light demand: medium
• ⚠️ Not compatible with very soft water (below KH 2) — prefers moderate water

5. Cryptocoryne wendtii / parva / beckettii

Why it works:

• A foreground/midground plant (10–25 cm / ~4–10 in tall)
• Tolerates 26–30 °C (79–86 °F)
• Various colors: green, brown, red (wendtii "Brown", "Florida Sunset")
• ⚠️ Watch for "crypt melt" — for the first 2–3 weeks after planting it sheds leaves, then recovers (normal)

6. Bucephalandra (all varieties)

A premium aquascaping plant:

• Grows on driftwood/rocks (like Anubias)
• Various colors: green, metallic blue, red, black
• Tolerance 22–30 °C (72–86 °F)
• ⭐ Very popular in modern biotopes

7. Ceratophyllum demersum (Hornwort) — a fast floater

What it's good for:

• A floating or anchored plant — your choice
• Grows extremely fast → absorbs nitrate, controls algae
• Provides hiding spots for discus fry
• Tolerance 18–30 °C (64–86 °F)
• Zero demands (light, CO₂, fertilizing)

8. Pistia stratiotes (Water Lettuce) — a floating plant

Benefits for discus:

• Diffuses light from above → discus stress less (diffuse light, as in the Amazon)
• Absorbs nitrate and phosphate
• Long roots (10–20 cm / ~4–8 in) → natural hiding spots
• Tolerance 22–30 °C (72–86 °F)
• ⚠️ Needs moderate-to-strong lighting and no airtight lid (the leaves rot from humid trapped air)

Plants to avoid with discus

💡 Rule of thumb: if the plant's label says a max temperature of 26 °C (79 °F), don't buy it for a discus tank.

Lighting for a planted discus tank

Basic rules

Recommended LED types

Modern LED fixtures (for example Aquael Leddy Smart, Chihiros A-series, Twinstar S-Line, JBL Solar LED Natur, Dennerle Nano Style) all work — match the wattage and length to your tank and pick a full-spectrum model with a timer.

Lighting mistakes

• ❌ Light 12+ hours/day → guaranteed algae
• ❌ Too-strong light (over ~0.8 W/L) with simple plants → brown and green algae explode
• ❌ No timer → discus stressed by sudden on/off

CO₂ — do you need it or not?

You DON'T need CO₂ if you plant:

• Anubias + Microsorum + Bucephalandra (epiphytes, low demand)
• Cryptocoryne + Vallisneria (hardy)
• Ceratophyllum + Pistia (floating)

You DO need CO₂ if you want:

• Echinodorus to grow fast (3–4 leaves/month instead of 1)
• More demanding plants (Rotala rotundifolia, certain Hygrophila)
• A densely planted tank (>60% surface)

A CO₂ system

A pressurized CO₂ setup typically includes: a cylinder + regulator, a diffuser, a drop checker, a solenoid valve and a timer.

⚠️ For discus, CO₂ must be turned off at night (when plants don't photosynthesize) and combined with an air-pump timer — discus are sensitive to low oxygen.

Planted or bare-bottom — which for discus?

See the detailed comparison in Planted vs bare-bottom for discus.

Common plant mistakes with discus

❌ "I'll buy all the plants in a set without checking the temperature" — about 70% of "tropical" store plants die at 30 °C (86 °F). Check each species against a reliable plant database.

❌ "I'll plant Anubias straight in the substrate" — the rhizome rots. Anubias attaches ONLY to driftwood, rocks or décor.

❌ "I'll light it 14 hours/day so the plants grow faster" — you'll get a brown/green algae explosion within 2 weeks. Max 10 hours.

❌ "I'll run CO₂ without a diffuser or drop checker" — overdose risk → discus suffocate (CO₂ displaces O₂).

❌ "The discus are eating my plants" — discus do NOT eat plants. If you see nibbled leaves, you have other fish (barbs, certain gourami).

❌ "I'll buy the cheapest plant from a general store" — often these are semi-aquatic plants that die within 2–4 weeks underwater (Spathiphyllum, Dracaena sold as aquatic).

Final checklist — a planted discus tank

Tick before buying plants:

• ☐ Tank temperature confirmed at 28–30 °C (82–86 °F)
• ☐ Plant list limited to species that tolerate 30 °C / 86 °F (see the list above)
• ☐ Substrate chosen (bare-bottom = epiphytes only | sand/active aqua-soil = any plant)
• ☐ Lighting ~0.3–0.5 W/L with a timer for 8–10 hours
• ☐ CO₂ decision (NO for epiphytes | YES for demanding plants)
• ☐ Root fertilizer tabs for Echinodorus, Cryptocoryne, Vallisneria
• ☐ Weekly liquid fertilizer (a fish-safe aquarium brand) — ~5–10 ml per 100 L (~26 US gal)
• ☐ An algae-cleaning plan (magnetic scraper, compatible algae-eating fish)

What to do next

📚 Learn more: Planted vs bare-bottom for discus — decide between the 2 styles.

🧮 Calculate: Aquarium volume calculator — how many liters you have and how many plants you need.

🛒 Buy: Lighting and water treatment — LEDs, dechlorinator and fertilizers for a planted tank.