Species guide
Frogbit Care Guide (Limnobium laevigatum)
Aquatic plant
Amazon frogbit (Limnobium laevigatum) has round lily pads and long dangling roots — popular shade for bettas and shrimp. It is not salvinia (tiny fern pairs) or duckweed (impossible specks). Manage surface flow or pads melt.
- Lily pad floater
- Long roots
- Betta shade
- Not salvinia
Quick facts
| Type | Surface lily pad — floating |
|---|---|
| Light | Medium at surface |
| CO₂ | Not required |
| Temp | 20–28 °C |
| Flow | Low surface ripple — high splash melts pads |
| vs salvinia | Salvinia tiny fern; frogbit round pads |
| vs duckweed | Duckweed speck invasive; frogbit bigger |
| Roots | Long — shrimp grazing |
Overview
Frogbit is the classic lily pad floater. Salvinia spreads faster as a fern mat. Duckweed is tiny and hard to remove — frogbit is scooped. Red root needs more light for color.
Betta scapes: betta planted tank · nano budget. Don’t block all light if you run Monte Carlo below.
Pads without melt
-
Step 1
Keep surface calm — deflect filter outflow
Splash melts pads to mush.
-
Step 2
Start with 5–10 pads, not full cover
Doubles in warm tanks fast.
-
Step 3
Remove yellow pads and short roots weekly
Export nutrients; reduce thickness.
-
Step 4
Corral with airline if filter pulls pads
Ring keeps floaters away from intake.
-
Step 5
Don't confuse salvinia in mixed bags
Frogbit round; salvinia paired tiny leaves.
Common problems
Pads melt to slime
Why: Too much surface agitation or cold drip.
Fix: Baffle outflow; stable temp.
Roots clog filter
Why: Long roots sucked in.
Fix: Airline corral; trim roots lightly.
Lower plants starved for light
Why: Full cover.
Fix: Remove 40% pads weekly.
White pad undersides
Why: Normal; yellow = dying.
Fix: No action if white; remove yellow pads.
Tank mates
Gear for this species
Landen Aqua Soil Substrate for Natural Planted Aquarium, Plant or Shrimp Stratum, Clay Gravel and Stable Porous Substrate for Freshwater Aquarium, Black Color 40lbs
Substrate vàng chuẩn Iwagumi / Nature Aquarium.
Budget nano under $50 — Frogbit is lily pad floater — calm surface, not salvinia mat
FAQ
Frogbit vs salvinia?
Frogbit round pads + long roots. Salvinia tiny fern mat.
Frogbit vs duckweed?
Duckweed specks invasive. Frogbit scooped easily.
Why melting?
Usually surface splash or cold water on pads.
Need CO₂?
No.
Trim roots?
Optional — shrimp like long roots.
Good for shrimp?
Yes — biofilm on roots.
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