Amazon Frogbit is one of the best floating plants for home aquariums: it shades the tank, soaks up nitrates that feed algae, gives fry and shrimp a hiding place and dangles attractive long roots. It is easy to grow, but a few simple mistakes make it melt. This guide covers how to keep it thriving in Indian tanks.
Quick answer: Amazon Frogbit (Limnobium laevigatum) is an easy floating plant that needs medium light, calm water and dry leaf tops. Keep surface flow gentle, avoid water splashing onto the leaves, leave a gap between the lid and the water, dose a little liquid fertiliser and remove extra plants weekly so they do not cover the whole surface.
Amazon Frogbit care sheet
| Parameter | Recommendation |
|---|---|
| Scientific name | Limnobium laevigatum |
| Origin | Central and South America |
| Size | Leaves 2–5 cm across; roots up to 10–20 cm |
| Placement | Water surface |
| Light | Medium |
| CO₂ | Not needed (takes CO₂ from the air) |
| Temperature | 20–28 °C |
| Water flow | Low at the surface |
| Growth rate | Fast |
| Difficulty | Easy |
| Price in India | From ₹90 on Anubias.in |
Benefits of Amazon Frogbit
- Algae control: fast growth pulls nitrate and phosphate from the water, starving algae. See plants that reduce algae.
- Shade: dims strong light for low-light plants like Anubias and reduces algae on their leaves.
- Cover: roots shelter fry and shrimplets and make shy fish feel secure.
- Betta-friendly: male bettas anchor bubble nests among the leaves.
- Water quality indicator: pale leaves or short roots often signal low nutrients.
Why is my Frogbit dying or melting?
The most common cause is wet leaf tops. Frogbit leaves have a water-repellent upper surface that must stay dry. When a filter outflow splashes water over them, or condensation drips from a tight lid, the leaves rot and turn yellow or transparent.
- Strong surface flow: turn the filter outlet downward or add a baffle; frogbit dislikes being pushed around.
- Lid too close: leave a few centimetres of air gap and some ventilation.
- Low nutrients: small, pale leaves and very long roots mean it is hungry; dose liquid fertiliser.
- Heat under lights: LEDs sitting directly on glass lids can overheat leaves in Indian summers; raise the light or improve airflow.
How to control Frogbit growth
In a healthy tank Frogbit can double in a couple of weeks. Once a week, scoop out the oldest and largest plants so no more than a third to half of the surface is covered. Fish that breathe at the surface, like bettas and gouramis, need open water, and plants below need some light. A floating ring made from airline tubing keeps Frogbit in one area.
Amazon Frogbit vs other floating plants
| Plant | Leaf size | Growth | Best for |
|---|---|---|---|
| Amazon Frogbit | 2–5 cm, round | Fast | Most tanks, betta tanks, nano to 3 ft |
| Duckweed | Tiny | Very fast, hard to remove | Ponds, tubs, feeder tanks |
| Water Lettuce | 5–15 cm rosettes | Fast | Larger tanks with open tops, ponds |
| Water Hyacinth | Large | Fast | Ponds and outdoor tubs |
Read more in our guide to floating plants for aquariums.
More floating plant guides:
Plants in this guide
Frequently asked questions
Is Amazon Frogbit good for beginners?
Yes. As long as the leaf tops stay dry and the surface is calm, it is one of the easiest and most useful plants you can add.
Does Frogbit need fertiliser?
In tanks with plenty of fish it often grows on fish waste alone. In lightly stocked tanks, a weekly liquid fertiliser keeps leaves green and roots healthy.
Can Amazon Frogbit grow in outdoor tubs in India?
Yes, in partial shade. Strong midday summer sun can scorch the leaves, so give it some afternoon shade.
Is Frogbit safe for fish and shrimp?
Yes. It is non-toxic, and shrimp and fry use its roots for shelter and grazing.
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