ROSY LOACH | PETRUICHTHYS SP.

Rosy Loach (Petruichthys sp. “rosy”) is a small, peaceful freshwater fish that has become increasingly popular in nano and planted aquariums. Known for its gentle nature, subtle coloration, and active schooling behavior, it’s an excellent choice for aquarists looking for something unique beyond the more common community fish.

Appearance

– Slender, torpedo-shaped body with hues of rosy pink, peach, or orange, often with a faint lateral stripe.
– Males typically show brighter colors, especially when displaying or during breeding.
– Reaches only 1–1.5 inches in length, making it a true nano species.

Behavior

– Peaceful and social, best kept in groups of 6 or more to encourage natural schooling behavior.
– Active mid- to bottom-dwellers, often seen exploring plants, wood, and leaf litter.
– Safe with shrimp, snails, and other small community fish.
– Known for their playful nature and gentle temperament, making them a favorite in nano aquascapes.

Tank Requirements

– Tank Size: 10+ gallons, ideally with plenty of plants and hiding spaces.
– Water Temperature: 72–78°F.
– pH: 6.5–7.5.
– Prefer soft to moderately hard water.
– Substrate of sand or fine gravel allows for natural foraging.

Diet

– Omnivorous micro-predators that feed on small invertebrates in the wild.
– In captivity, accept high-quality micro pellets, crushed flakes, frozen and live foods like daphnia, cyclops, and baby brine shrimp.
– A varied diet enhances color and activity.

Breeding

– Breeding is rare in aquariums but possible under the right conditions.
– Males intensify in color when courting females.
– Eggs are typically scattered among plants or substrate without parental care.

Benefits in the Aquarium

– Perfect nano fish with peaceful community compatibility.
– Attractive rosy hues add subtle but unique coloration to planted tanks.
– Schooling behavior adds movement and life, especially in aquascaped layouts.
– Hardy and beginner-friendly once established in a stable tank.

Rosy Loaches (Petruichthys sp.) are charming, small schooling fish that combine beauty, activity, and compatibility. Their peaceful nature and rosy glow make them an ideal choice for planted community aquariums, especially for aquarists who love nano fish and shrimp-safe companions.