Its job in your tank
Root feeder and foreground carpet.
A short green lawn across the front of your tank
Micro sword (Lilaeopsis brasiliensis) grows bright green blades 1–3 inches tall and spreads by runners into a dense lawn. Despite the name, it isn’t a sword plant. It’s a grass-like plant from South America.
The problem
Most carpet plants are sold with a CO2 system attached. Without one, many of them fade away.
How it fits the Father Fish Method
Father Fish has kept fish for more than 70 years, and his method has helped thousands of aquarists build tanks that run on biology instead of bottles. A layer of living soil sits under a sand cap and feeds rooted plants for years. You plant heavily on day one and skip the need for artificial additives or CO2.
| Plant Type | Grass-like carpet |
|---|---|
| Height | 1–3 inches |
| Origin | South America |
| Growth Pattern | Spreads by runners |
| Light Requirement | Low to moderate |
FAQ
Does micro sword require CO2 to grow?
No, micro sword can grow well without CO2. It thrives in soil-based tanks with natural nutrient cycling.
How fast does micro sword spread?
It spreads gradually through runners, forming a dense carpet over several weeks to months depending on tank conditions.
Can micro sword be used in a planted tank with fish?
Yes, it is suitable for planted tanks with fish as long as the tank has a living soil layer and stable water conditions.
Dominic Brown –
Installed micro sword in my soil-based tank right after setting up the living soil layer. It grew steadily within two weeks and created a lush green front carpet. No CO2 needed. Fish seem to be thriving with it.
Benjamin Anderson –
The plant spread nicely over a few weeks. I didn’t have to add any fertilizers. It’s a great fit for the Father Fish Method. Only a bit slow at first, but now it’s covering the front nicely.
Faith Nolan –
Love how it fills the foreground without needing special equipment. The green blades are dense and natural-looking. Works perfectly with my low-light setup and soil-based system.