Can Fiddler Crab live with Red-Line Rasbora?
Caution — with care
Why
- Fiddler Crab can grab Red-Line Rasbora while it sleeps — only fast mid/top-water fish are reasonably safe.
- No overlapping pH: Fiddler Crab wants 7.5–8.5 but Red-Line Rasbora wants 5–7.
- No overlapping water hardness: Fiddler Crab wants 15–25 dGH but Red-Line Rasbora wants 1–8 dGH.
Side-by-side
| Fiddler Crab | Red-Line Rasbora | |
|---|---|---|
| Temperature | 72–82°F | 73–81°F |
| pH | 7.5–8.5 | 5–7 |
| Hardness (GH) | 15–25 dGH | 1–8 dGH |
| Adult size | 2" | 1.75" |
| Temperament | Peaceful | Peaceful |
| Min tank | 15 gal | 15 gal |
Together, plan on at least 15 gallons.
How to make it work
- Only combine with fast, mid/top-water fish and give the tankmates plenty of escape routes.
- Target the overlapping water-parameter range and acclimate slowly.
Sort it with: GH remineraliser
Design the whole tank, not just the stocking
Skapelab plans a complete, buildable planted aquarium around your fish — a hand-illustrated layout, the exact plants and hardscape, a placement map, and a full equipment and shopping list. Free.
Design a tank with Fiddler Crab, Red-Line Rasbora →Everything compatible with Fiddler Crab · …with Red-Line Rasbora