Myriophyllum sp. "Guyana"

Overview & characteristics

Myriophyllum sp. "Guyana" is a stem plant used in planted aquariums and aquascapes. In most layouts it is treated as a stem plant that influences the overall structure of the scape. In our database this plant is marked as suitable for aquarium use. It can be explored alongside similar stem plants inside the AquariumLesson plant library.

For broader context on plant categories and planted tank basics, see our Aquarium Plants lesson.

Habitat & water conditions

Under aquarium conditions this plant is usually kept in a temperature range of 20–30 °C. The reported carbonate hardness range is from 0 °dKH. Compatibility with tap water depends on local water chemistry and long-term stability. Target nutrient ranges in the dataset include nitrate around 10–50 mg/L, phosphate around 0.5–3 mg/L, potassium around 5–50 mg/L, iron around 0.05–0.2 mg/L. Maintaining stable levels is generally considered important in planted aquariums. Overall it is regarded as suitable for long term aquarium use, as long as temperature, pH and nutrient supply remain reasonably stable. For most home aquariums these ranges are well within what can be achieved with regular water changes and careful fertilizing, as documented across many profiles in the AquariumLesson plant library.

Key care ranges at a glance:

• Temperature: 20–30 °C
• KH: from 0 °dKH
• Nutrients: NO₃ 10–50 mg/L, PO₄ 0.5–3 mg/L, K 5–50 mg/L, Fe 0.05–0.2 mg/L

To translate ranges into your actual setup, tools like Aquarium Lighting Calculator · Aquarium Volume Calculator can help.

Growth & morphology

In terms of growth form this plant behaves like a stem with a medium growth rate in most aquariums. The database indicates that emersed growth is possible. Practical results may vary depending on humidity and cultivation method.

Care requirements

Light requirement in the dataset is listed as medium. Plant appearance can vary depending on light intensity and overall system balance. Consistent macro- and micronutrient dosing, combined with regular water changes, helps to prevent deficiencies and keeps the plant responsive to trimming. Taken together, these requirements make the plant a suitable candidate for long term display in aquariums that offer stable lighting, CO₂ and water quality.

To translate nutrient target ranges into real dosing amounts, the Fertilizer Dosing Calculator can help. To better understand nutrient balance and deficiency patterns, see our lessons on macronutrients and micronutrients.

Placement in aquascapes

Aquascapers usually treat it as a stem and combine it with foreground and background plants to build a layered composition. It is commonly used to keep layering clean and maintain long-term layout structure with predictable growth. Those who enjoy working with stem layouts can discover more options by exploring the corresponding section of the AquariumLesson plant library.

More aquascaping and planting guides can be found in our Lessons overview.