Rotala mexicana 'Goias' (often sold as "Mexicana Red")

Overview

Rotala mexicana 'Goias', commonly called Mexicana Red, is a small-leaved red stem plant prized in aquascaping because it can be grown as a compact red foreground or midground accent. It is distinct from Rotala wallichii, although the two are sometimes confused by sellers.

Appearance

• Tiny, narrow leaves.

• Colors range from green and orange to pink and deep red.

• Young stems often creep along the substrate.

• Dense plantings become bushy and upright.

• Produces a fine-textured appearance that contrasts well with larger-leaved plants.

Size

• Typically maintained at 2–10 cm tall in the foreground.

• Can reach 10–15 cm or more if allowed to grow vertically.

• Very suitable for nano aquariums.

Difficulty

Medium to Advanced

This plant performs best in a stable, high-tech aquarium with:

• Strong lighting

• Consistent CO₂

• Regular fertilization

Lighting

Strong light is essential for:

• Deep red coloration

• Compact growth

• Creeping habit

Under weaker light:

• Leaves become greener.

• Stems stretch.

• Color intensity decreases.

CO₂ Requirements

Pressurized CO₂ is strongly recommended.

Without adequate CO₂:

• Growth becomes slower.

• Color fades.

• Plants may become sparse and less compact.

Nutrient Requirements

Responds well to:

• Stable nitrate levels

• Adequate phosphate

• Iron supplementation

• Complete micronutrient dosing

Coloration is usually strongest when nutrients are balanced and the plant is not subjected to major fluctuations.

Placement

Works well as:

• Foreground accent

• Midground accent

• Nano-tank focal point

• Low red bush

• Carpet-like red patch in high-tech aquascapes

Growth Pattern

One of its unique characteristics is its creeping growth.

• Freshly planted stems often grow horizontally.

• As density increases, stems begin growing upward.

• Frequent trimming encourages compact bushes.

• Replanting tops creates dense clusters.

Propagation

Very easy.

1. Cut healthy stem tops.

2. Replant the cuttings.

3. New side shoots emerge from the remaining stems.

Regular trimming produces thicker, denser growth.

Ideal Water Parameters

• Temperature: 20–28°C

• pH: 5.5–7.0

• Soft to moderately soft water preferred

• Low to moderate KH

Common Problems

Rotala mexicana 'Goias' vs Rotala wallichii

Why Aquascapers Like Mexicana Red

• Rare and distinctive appearance.

• One of the few genuinely small red plants.

• Excellent for nano aquariums.

• Can be used near the front of the tank.

• Creates strong contrast with green carpeting plants.

• Develops attractive red and pink tones under optimal conditions.

If your plant is sold specifically as "Rotala wallichii mexicana red", a photo would help because that trade name is often used inconsistently, and sellers sometimes mix up Rotala wallichii and Rotala mexicana 'Goias'.