Bloody Mary Hillstream Loach (Gastromyzon sp. ‘Bloody Mary’)
Bring rare beauty and fascinating behavior to your aquarium with the Bloody Mary Hillstream Loach, also known as the Double Red Tail Borneo Loach. This extraordinary hillstream loach features stunning blood-red tail fins and vibrant markings, making it a showstopper in any aquascaped or river-style tank. Sought after by collectors and aquascapers alike, the Bloody Mary Hillstream Loach offers both visual appeal and dynamic algae-eating action.
The Bloody Mary Hillstream Loach is native to the fast-flowing, oxygen-rich streams of Borneo. This unique species displays deep red tail and dorsal fins, earning it a reputation for striking visual presence in well-maintained tanks.
| Specifications |
|---|
| Species: Gastromyzon sp. ‘Bloody Mary’ |
| Common Name: Double Red Tail Borneo Loach |
| Origin: Borneo |
| Water Type: Freshwater |
| Temperature: 22–26°C |
| Water pH: 6.0–7.0 |
| Hardness: Soft to moderately soft |
| Behavior: Active, schooling, algae eater |
| Compatibility: Peaceful with other loaches and mid-sized community fish |
| Minimum Tank Size: 30 gallons |
| Flow Requirement: Moderate to strong current |
FAQ
What makes the Bloody Mary Hillstream Loach unique compared to other loach species?
The Bloody Mary Hillstream Loach is distinguished by its striking blood-red tail and dorsal fins, which are rare among loach species. Its vibrant coloration and active behavior make it a standout in any aquarium setup.
Is the Bloody Mary Hillstream Loach suitable for beginners?
This species is best suited for experienced aquarists due to its need for strong water flow, specific water parameters, and a well-maintained environment. Beginners may find it challenging to meet its requirements.
How does the Bloody Mary Hillstream Loach contribute to tank maintenance?
It is an active algae eater, helping to control algae growth on glass, rocks, and plants in a river-style or flowing aquarium setup.

Lisa Duncan –
The Bloody Mary Hillstream Loach is absolutely stunning. Its red tail stands out in my 40-gallon tank with strong flow. I’ve had it for three months and it’s very active, cleaning algae regularly. Only issue is it needs a well-oxygenated, fast-flowing setup, which I’ve had to adjust to maintain.
Leonard Burgess –
Beautiful fish with vibrant colors. I noticed it’s more active in the morning and evening. It’s not for small tanks, but in a 30-gallon with strong current, it thrives. I’ve added a few other loaches and they get along well.
Carolyn Gray –
This loach is a true showpiece. The red fins are vivid and it moves gracefully through the water. I keep it in a river-style tank with driftwood and rocks. It’s peaceful and helps reduce algae on the substrate.