Species guide
Vallisneria Care Guide (Background Runner)
Aquatic plant
Vallisneria is the classic background runner for low-tech tanks. Plant the crown at substrate height, give it room to send runners, and it will screen the back wall without injected CO₂.
- Easy
- Background
- Runners
- Low–medium light
Quick facts
| Light | Low–medium; too much PAR + no flow → algae on straps |
|---|---|
| CO₂ | Optional — grows without injection |
| Temp | 20–28 °C (68–82 °F) |
| pH / GH | 6.5–8.0, moderate–hard OK (likes some GH) |
| Planting | Crown at substrate surface; roots buried |
| Spread | Runners — pull extras or leave a curtain |
| Fert | Root tabs in sand + lean liquid |
| Height | 30–80+ cm depending on species / lighting |
Overview
Val is a rosette that runs, not a stem you replant every week. Shipping melt looks scary; the crown usually pushes new straps if it stayed wet. Do not bury the crown like a bulb.
Easy neighbors: Anubias · Java fern · Crypt wendtii. Beginner list: 10 easy plants. Low-tech triangle: light / CO₂ / fert. Budget: low-tech under $150.
How to plant and keep it
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Step 1
Plant the crown, not a deep hole
Fan the roots into substrate. The pale crown sits at the surface. Buried crowns rot.
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Step 2
Give a back-wall strip, not one lonely plant
Three–five plants along the back. Runners fill gaps in weeks if light and GH are stable.
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Step 3
Feed the roots in inert sand
A root tab every 10–15 cm. Liquid fert lean 2–3×/week if straps yellow.
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Step 4
Trim by pulling whole straps
Do not cut across mid-leaf if you can pull old outer straps from the crown.
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Step 5
Control runners before they swamp foreground
Uproot runner plants you do not want. Val will take Monte Carlo space if you ignore it.
Common problems
All straps melt after shipping
Why: Emersed-to-submersed + transit.
Fix: Leave the crown 2–3 weeks. New leaves from the center.
Transparent patches / holes
Why: K deficiency or old tissue.
Fix: Lean potassium in liquid fert. Remove worst straps.
Black beard on tips
Why: Too much light + organic film.
Fix: Lower photoperiod; more flow. See BBA order if it spreads.
Stops running
Why: Low light or exhausted tabs.
Fix: Move closer to light; refresh root tabs.
Tank mates
- Fish: Corydoras on sand, neons, guppies — they ignore val.
- Diggers: goldfish and large cichlids uproot runners. Not a goldfish plant.
- Shrimp: fine. Cherry graze biofilm on straps.
- steals space from: Monte Carlo if runners reach the front.
Gear for this species
API Root Tabs Freshwater Aquarium Plant Fertilizer 10-Count Box
Viên phân gốc API — cây ăn rễ, bổ sung macro cho nền.
Landen Aqua Soil Substrate for Natural Planted Aquarium, Plant or Shrimp Stratum, Clay Gravel and Stable Porous Substrate for Freshwater Aquarium, Black Color 40lbs
Substrate vàng chuẩn Iwagumi / Nature Aquarium.
Low-tech setup under $150 — Val is a background curtain, not a carpet substitute
FAQ
Do I need CO₂ for Vallisneria?
No. Medium light and root tabs are enough for a full curtain.
Jungle val vs spiralis?
Jungle/americana gets huge. Spiralis/nana types stay more tank-friendly. Read the label.
Can I plant val in gravel only?
Yes if you use root tabs. Sand + tabs is cleaner for corys.
Why is it melting after I moved it?
Crypt-like shock. Leave the crown. New growth from the center.
Will it block my filter intake?
Long straps can. Keep intake sponged; trim the nearest runners.
Is it okay with a betta?
Yes — soft straps, no sharp edges. See betta planted tank.
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