Eleocharis acicularis T/C CUP

Eleocharis acicularis is a dwarf hair grass. 
However the way it will grow will be taller than parvulus mini. 1-2" height

The plants commonly known as dwarf hairgrass and sold under the names Eleocharis parvulus and Eleocharis acicularis are a popular choice for aquarium foregrounds, but they are distinct species with different growth habits. The name you used, Eleocharis parvulus (acicularis), highlights a common point of confusion in the aquatic plant trade . Here are the details for each.

 Clearing Up the Confusion: E. acicularis vs. E. parvula

In the aquarium hobby, the names are often used interchangeably, but they refer to two different plants. To make it simple, here is a quick comparison:

A key botanical difference is that E. parvula produces small tubers on its underground stems, which E. acicularis does not . Furthermore, a plant often sold as E. parvula or "mini" hairgrass is frequently another species altogether, Eleocharis pusilla, which stays even shorter .

 General Care Guide for Dwarf Hairgrass

Regardless of which specific species you have, their care requirements are very similar. They are considered easy to moderate plants to keep .

• Lighting: Moderate to high lighting is essential for these plants to grow compact and form a dense carpet. In lower light, they will grow taller and more slowly .

• Substrate: A fine-grained, nutrient-rich substrate is best. This allows the fine roots to establish easily and access nutrients. Aquarium soil or sand with root tabs underneath works well .

• CO₂ Injection: CO₂ supplementation is not strictly required but is highly recommended if you want a lush, fast-spreading carpet. Without CO₂, the growth will be very slow and the carpet may be patchy .

• Water Parameters: They are adaptable to a wide range of conditions, but they thrive in the following:

  • Temperature: 20-26°C (68-79°F) .

  • pH: Slightly acidic to neutral, between 5.0 and 7.5 .

• Propagation: Both species spread via runners (stolons) that grow horizontally under the substrate, sending up new plantlets along the way. This is how they form a carpet .

• Maintenance: Regular trimming is key. Use sharp scissors to "mow" your hairgrass lawn to the desired height. This encourages denser, lateral growth and prevents the lower leaves from yellowing due to lack of light .

 Aquascaping and Tank Benefits

Dwarf hairgrass is a versatile plant that offers both aesthetic and practical benefits.

• Creating a Lawn: It is the quintessential plant for creating a lush, green "lawn" in aquascaping styles like the minimalist Iwagumi layout .

• Foreground to Midground: The shorter E. parvula/pusilla is perfect for the extreme foreground, while the taller E. acicularis can be used to create depth as a midground plant or on a slope .

• Natural Habitat for Livestock: The dense thickets provide excellent shelter for small, shy fish and are a paradise for shrimp. Shrimp will graze on the biofilm that grows on the grass blades, and the carpet offers security for baby shrimplets .

• Water Quality: Like all plants, it helps maintain water quality by absorbing excess nitrates and producing oxygen .