Platinum Halfbeak (Dermogenys pusilla)

The Platinum Halfbeak is a sleek, silver-metallic fish that spends almost 100% of its time at the very top of the water column. Native to the slow-moving rivers and estuaries of Southeast Asia, they are masters of surface hunting. Unlike many other small fish, Halfbeaks are livebearers, meaning they give birth to free-swimming fry. Their unique morphology and predatory "hovering" behavior make them a fascinating addition for hobbyists looking for something beyond the typical tetra or guppy.

Key Information

• Common Name: Platinum Halfbeak, Silver Halfbeak, Wrestling Halfbeak

• Scientific Name: Dermogenys pusilla

• Origin: Southeast Asia (Thailand, Malaysia, Indonesia, Vietnam)

• Max Size: 5–7 cm

• Lifespan: 3–5 years

• Temperament: Generally peaceful, but males can be territorial with each other.

• Diet: Carnivore/Insectivore – Prefers fruit flies, bloodworms, daphnia, and high-quality floating flakes. They rarely eat food that falls to the bottom.

• Care Level: Moderate (Sensitive to transport and jumping)

Water Parameters

Parameter	Value
Temperature:	24–28°C
pH:	7.0–8.0 (Prefers slightly alkaline)
Hardness:	10–20 dGH
Minimum Tank Size:	60L+ (Long tanks are better than tall ones)

Behaviour & Tank Compatibility

Halfbeaks are social but can be competitive. It is best to keep them in a group of 5 or more to disperse minor aggression among males. They are "top-dwellers" and occupy a niche that many other fish ignore. Ideal tank mates include peaceful bottom-dwellers like Corydoras or middle-dwellers like Rasboras. Avoid keeping them with aggressive surface-dwellers or large fish that might see their slender bodies as a snack.

Ideal Tank Setup

• Secure Lid: Non-negotiable. Halfbeaks are incredible jumpers and will launch themselves out of the tank if startled. Ensure there are no gaps around cables or filters.

• Floating Plants: They feel most secure under cover. Use Amazon Frogbit, Salvinia, or Water Lettuce to provide shade and hunting grounds.

• Surface Area: They need horizontal space more than vertical depth. A "long" tank provides more territory for these surface-oriented fish.

• Gentle Current: While they like clean water, a turbulent surface can make it difficult for them to feed and rest.

• Salt Tolerance: They are often found in brackish water in the wild. Adding a small amount of aquarium salt (1 teaspoon per 5-10 liters) can help prevent disease and stress.