The Rosy Loach (Petruichthys sp. “Rosy”, formerly Yasuhikotakia sp.) is a charming and lively nano bottom-dweller, prized for its rosy-pink to orange hues, peaceful nature, and active behavior in small aquariums. Reaching only 2cm in length, this miniature loach is perfect for nano aquariums, planted setups, and community tanks with other tiny, non-aggressive fish.

Native to streams and slow-moving waters in Myanmar, Rosy Loaches are often overlooked due to their size—but they are packed with personality. They prefer shoaling in small groups and are constantly active, making them a delightful and eye-catching addition to any setup. Whether you’re creating a peaceful biotope or a colorful nano tank, the Rosy Loach is a standout choice for aquarists of all levels.

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🐠 Key Features:

• Scientific Name: Petruichthys sp. “Rosy”

• Common Name: Rosy Loach

• Size: 2cm (adult)

• Temperament: Peaceful, active, social

• Difficulty Level: Beginner-friendly

• Tank Zone: Bottom and mid-level

• Best kept in groups of 6 or more for natural behavior

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🌊 Water Conditions

Rosy Loaches prefer warm, clean water with gentle flow and a natural, planted layout that mimics their streamside origins.

• Temperature: 22–27°C (72–81°F)

• pH: 6.5–7.5

• Hardness: 3–10 dGH

• Tank Size: 10 gallons minimum for a small group

• Substrate: Sand or fine gravel

• Filtration: Gentle sponge filter or low-flow system

• Lighting: Moderate (prefer shaded areas and plant cover)

Provide plenty of plants, rocks, and hiding spots to keep them comfortable and stress-free.

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🐟 Tank Mates

Rosy Loaches are ideal for peaceful community aquariums with similarly sized or gentle tank mates.

Great companions include:

• Celestial pearl danios

• Ember tetras

• Pygmy corydoras

• Micro rasboras (like Chili or Phoenix)

• Dwarf shrimp (if the loaches are well-fed)

Avoid:

• Larger or aggressive fish

• Species that may outcompete them for food

They do best in quiet tanks with plenty of horizontal swimming space.

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🍽️ Feeding Habits

As omnivorous bottom-feeders, Rosy Loaches enjoy a varied diet and will happily scavenge for leftover food.

Best foods include:

• Sinking nano pellets or wafers

• Crushed flakes

• Frozen daphnia or cyclops

• Live or frozen baby brine shrimp

• Microworms and other tiny live foods

Feed small portions 1–2 times daily, ensuring food reaches the substrate.

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🧼 Care Tips:

• Keep in groups of 6 or more to encourage confidence and natural shoaling behavior

• Perform regular water changes (25–30%) to maintain pristine conditions

• Ensure smooth substrate to protect their sensitive undersides

• Cover the tank tightly—though rare, Rosy Loaches can jump

They are hardy once established but do best in well-maintained, stable environments.

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🌿 Why Choose Rosy Loaches?

Tiny but full of charm, Rosy Loaches are perfect for aquarists who want activity, color, and peace in a small package. Their playful nature, ease of care, and compatibility with other nano species make them an excellent addition to planted aquariums and small community tanks.

Add lively beauty to your nano tank—bring home Rosy Loaches today!