Blue Tail Borneo Sucker Care Guide - Aquarium Setup, Diet & Breeding

The Blue Tail Borneo Sucker is a small hillstream loach with a flattened body and broad, wing-like pectoral and pelvic fins. Its specialised underside allows it to cling securely to smooth stones in powerful currents, while its blue-toned tail provides an attractive contrast to the mottled brown, gold and grey patterning across the body.

This species spends much of its time resting on rocks, grazing surfaces and moving between sheltered patches in the streambed. It is generally peaceful, although individuals may briefly jostle over the best feeding spots. With enough space and cover, it usually displays interesting natural behaviour without becoming aggressive.

In the wild, Gastromyzon aeroides inhabits clear mountain and upland streams where rainfall keeps the water moving and well oxygenated. The streambed is typically made up of rounded stones, gravel and occasional leaf litter, with algae and microorganisms growing over exposed surfaces.

The Blue Tail Borneo Sucker belongs to the Gastromyzon group, often known in the aquarium trade as hillstream loaches or Borneo suckers. Its specialised body shape and flowing-water lifestyle make it particularly distinctive among small freshwater aquarium fish.

The Blue Tail Borneo Sucker is native to clear, fast-flowing streams in northern Borneo, particularly Sabah in Malaysian Borneo. It comes from shallow rocky waterways with strong current, high oxygen levels and abundant algae-covered surfaces.

A group should be given at least 60 litres, with a footprint of around 60 x 30 cm or larger rather than a tall, narrow aquarium. Use a powerful but safe filter or stream-style circulation system to create vigorous flow and excellent oxygenation, while leaving calmer resting areas behind rocks. Cover the base with smooth rounded stones, fine gravel or sand, and add flat rocks, driftwood and hardy plants such as Anubias or Java fern. A mature aquarium with established algae and biofilm is especially valuable, and the tank must have a secure lid because these fish can climb onto surfaces above the waterline.

Up to approximately 6 cm (2.4 inches) in total length. Females are usually a little deeper-bodied and may grow slightly larger than males.

Their natural diet consists largely of algae, aufwuchs and the small organisms living within the biofilm on rocks. Offer a mature aquarium with naturally growing algae, supplemented with algae wafers, spirulina-based foods, sinking vegetable pellets and blanched courgette, spinach or cucumber. Occasional offerings of suitably sized frozen or live foods such as brine shrimp, daphnia or bloodworm can provide variety, but rich animal foods should not replace their plant-based staples.

Blue Tail Borneo Suckers suit peaceful, similarly sized inhabitants that appreciate clean, oxygen-rich water, including white cloud mountain minnows, small danios, peaceful rasboras, dwarf river loaches and other non-aggressive hillstream loaches. They should not be housed with large cichlids, boisterous barbs, aggressive loaches or fin-nipping species. Avoid combining them with fish that require consistently warm tropical temperatures, as their preferred conditions are cooler than those of many community fish.

Blue Tail Borneo Suckers are not commonly bred in home aquariums, but spawning can occur in a mature, well-established group. Condition them with plentiful algae, biofilm and small frozen foods, then provide clean, highly oxygenated water and plenty of stones or crevices where eggs can be deposited. The eggs are small and vulnerable to being eaten, while newly hatched fry need access to natural biofilm and very fine foods.

Sexual differences are subtle. Mature females tend to have a broader, fuller body, particularly when viewed from above, while males are generally slimmer and may show a more angular head and body profile.