Pogostemon helferi 'Downoi'
Crinkled emerald rosettes — the little star of the Thai foreground.
Downoi grows as a low, compact rosette of tightly crimped bright green leaves that hug the substrate and spread by side shoots into a textured foreground mat. It is one of the few foreground plants with genuine visual character rather than flat cover. Farm-raised, pesticide-free, and shipped submersed-grown.
What it needs to thrive
- Lighting
- Moderate to high — 50–80 PAR keeps the rosette tight and low.
- Flow
- Gentle to moderate; avoid blasting the crown.
- Feeding
- Column and root feeder — dose a complete liquid fertilizer weekly; root tabs for heavy substrate rooters.
- Temperament
- Peaceful — shrimp-safe, fry-safe, and grown pesticide-free.
- Difficulty
- Intermediate
- Ideal Tank Size
- 10 gallons and up
- Water Parameters
- 70–80°F · pH 6.0–7.5 · GH 3–10 · KH 1–8 · nitrate 10–25 ppm with a complete liquid fertilizer
Foreground and along hardscape edges. Space rosettes 2 inches apart and let them fill in.
Peaceful. Shrimp love picking biofilm out of the crimped leaves.
Quarantine, dip, and acclimation
Quarantine
Hold all new fish in a bare-bottom 10–20 gallon QT for a minimum of 4 weeks. Observe for flashing, clamped fins, white spots, or breathing changes. Treat preventatively with copper (1.75–2.5 ppm chelated) or tank-transfer method for ich, plus a praziquantel course for flukes. Invertebrates and corals skip QT but go through dip and observation instead.
Recommended coral dip
For every new coral: a 5–10 minute bath in your reef-safe dip of choice (Bayer Complete, CoralRx, or Reef Primer) following label dosage, followed by two clean saltwater rinses. Inspect plugs and bases for flatworms, pyramid snails, and eggs — remove or refrag onto clean plugs before placing in display.
Acclimation
Float sealed bags in your QT or display for 15 minutes to match temperature. Then drip acclimate at 2–4 drops per second for 45–60 minutes until volume has tripled. Net livestock into the tank — never pour shipping water in. Dim the lights for the first 24 hours to reduce stress.
