Cryptocoryne Mioya

Quick facts

Identity

Also known as

Mi Oya Crypt; Water Trumpet

Synonyms

Cryptocoryne wendtii var. Mi Oya

Environment

Freshwater

Native to

Sri Lanka

Habitat

Shaded, gently flowing streambeds and riverbanks of the Mi Oya river in Sri Lanka's warm dry-zone lowlands, growing submersed in the channel and emersed along the banks as water levels drop

Sourcing

Captive-bred

Conservation

Not Evaluated

Care

Care level

Easy

Growth form

Rosette

Max height

6 – 14 in (15 – 36 cm)

Spread

12 in (30 cm)

Growth rate

Slow

Placement

Midground, Background

Water

Temperature

72 – 86 °F (22 – 30 °C)

pH

6.0 – 7.5

GH

3 – 12 dGH

dKH

1 – 18 dKH

Flow

Low-Moderate

Light

Low

CO₂

Beneficial

Planting

Substrate

Nutrient-rich required

Feeds from

Roots

Fertilizer needs

High

Colors

Green, Brown, Red

Feeding & breeding

Propagation

Runners, Rhizome division, Splitting

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Care guide

Overview

Collected from the shaded, slow-flowing Mi Oya river in Sri Lanka's dry zone, this crypt forms slender, ruffled rosettes that shift from emerald green under low light to copper-brown as intensity rises. It is a heavy root feeder that spreads into a broad clump over time. Leave it undisturbed once planted, as uprooting readily triggers melt.

Care

One of the larger and hardier members of the wendtii group, this crypt tolerates a wide swing of temperature, hardness and pH, making it forgiving in both low-tech and planted setups. Leaf color and posture respond to light intensity: low light produces more upright, olive-green growth, while medium to high light brings out a flatter rosette with hammered, reddish-brown foliage. Give it room in the midground to background, since mature specimens spread into a broad clump rather than staying compact.

Planting & trimming

Bury only the roots and rhizome base while keeping the crown at or just above the substrate surface, spacing plants a few inches apart to allow the rosette to fill out. It adapts readily between emersed and submersed forms, so it can be started in a humid emersed setup before flooding. Once established, avoid moving or replanting it, since disturbance is the most common trigger for melt; trim spent or algae-covered leaves individually at the base instead.

Fertilizing

Growth depends mainly on what the roots can reach, so push root tabs into the substrate near the rhizome every one to two months and use a nutrient-rich aquasoil or enriched gravel base. A weekly dose of liquid fertilizer supplies trace elements such as iron for the leaves, though the bulk of nutrition should still come from the substrate. Yellowing or pinholed older leaves usually point to a nutrient shortfall rather than disease.

Propagation

Propagation is mainly by runners sent out from the rhizome, which produce plantlets that can be separated once they have their own root system and replanted elsewhere. Mature clumps can also be divided by splitting the rhizome into sections, each retaining some roots and leaves. Growth is slow to medium, so new plantlets take some time to appear compared with faster-spreading crypts.

Problems

New imports or plants disturbed by uprooting and large water changes commonly go through crypt melt, where leaves dissolve to mush within days. The rhizome and roots usually survive this and push out fresh, better-adapted leaves within a few weeks, so the remaining stump should be left in place rather than discarded. Algae film on the older, slow-growing leaves is common under strong lighting and is best managed by trimming affected leaves and improving nutrient balance and flow.

Sources

1. Cryptocoryne wendtii Mi Oya care: light, CO2 and placement · TankBud
2. Cryptocoryne wendtii 'Mi Oya' - Flowgrow Aquatic Plant Database
3. Cryptocoryne Mi Oya Care Guide | Melbourne Tropical
4. Mi Oya Crypt Aquarium Plant Profile | TankFlare

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