Scarlet Badis Tank Mates: Micro Predator Compatible Species
The scarlet badis is one of the smallest predatory fish available to hobbyists, yet its intense scarlet-and-blue banding and bold personality make it a centrepiece fish in any nano setup. Choosing the right scarlet badis tank mates is critical — this species will attempt to eat anything that fits in its mouth, and dominant males will harass fish that resemble their own colouration. Gensou Aquascaping at Everton Park, Singapore has helped many local hobbyists build thriving nano communities around Dario dario, and the principles are straightforward once you understand the fish’s behaviour.
Understanding the Scarlet Badis Temperament
Dario dario originate from slow, shallow, vegetation-dense streams in West Bengal, India. Males are intensely territorial with each other and will chase competitors relentlessly in a small tank. Females, which are a drab olive-brown, are often ignored unless the male is breeding. The key temperament trait is predation: these fish hunt micro-invertebrates by sight and will pursue anything moving and small enough to engulf. A standard rule is to avoid any creature under 1 cm in body size.
Ideal Tank Mates: Small, Fast Surface Dwellers
Microdevario species — such as Microdevario kubotai (the neon green rasbora) — are excellent companions. They are fast, inhabit the upper water column, and their slim bodies pass the size test. Emerald dwarf rasboras (Danio erythromicron) work similarly well; they school actively, spend time mid-column, and are too large and quick for a scarlet badis to target. Both species are commonly available in Singapore at $1.50–3 each and settle well in soft, slightly acidic PUB tap water after a dechlorinator treatment.
Small Rasboras and Micro Tetras
Chili rasboras (Boraras brigittae) are a borderline choice. At 2 cm they sit right at the edge of the scarlet badis’s prey size. In a heavily planted tank with multiple hiding zones, they generally coexist without losses, but you should monitor closely in the first week. Ember tetras are also borderline — see our dedicated tank mate guide for ember tetras for more detail on that pairing. Better micro-tetra options include lampeye killifish, which occupy the surface and are agile enough to evade pursuit.
Snails and Invertebrates
Nerite snails are fully compatible — their shell prevents predation and they fulfil a useful algae-control role. Avoid cherry shrimp (Neocaridina davidi) unless you accept losses; adults survive but juveniles and newly moulted shrimp are consistently eaten. Amano shrimp (Caridina multidentata), being significantly larger and faster, coexist more reliably. Pond snails and ramshorn snails similarly survive without issue.
Species to Avoid
Bettas are an obvious incompatibility — both fish show intense territorial responses to similar colouration and body shape, and fights are severe. Avoid guppies despite their small size; flowing finnage triggers the scarlet badis’s predatory response and males will be fin-nipped incessantly. Corydoras are too active and bottom-dwelling, competing for the same hiding spots the badis uses as ambush positions. In general, skip any fish under 1.5 cm, anything with exaggerated fins, and other micro-predator species.
Tank Setup for a Compatible Community
A 30–40 litre planted nano suits a pair of scarlet badis alongside a small shoal of compatible companions. Dense planting with Rotala, java fern, and floating cover creates enough visual breaks to reduce territorial tension. Maintain water at 24–26°C, pH 6.5–7.0, and TDS under 200 ppm — conditions achievable with Singapore tap water treated with a good conditioner. Feed the scarlet badis live or frozen Artemia, daphnia, or micro worms; they are notoriously reluctant to accept dry food, which can lead to starvation in community tanks where faster fish outcompete them at feeding time.
Managing Multiple Males
If you want more than one male scarlet badis, scale the tank accordingly. A single male in 20 litres is comfortable. Two males require a minimum of 40 litres with dense planting creating genuine territory breaks. Three or more males rarely work in a home aquarium unless the tank exceeds 80 litres and sight lines are heavily broken by hardscape. The team at Gensou Aquascaping generally recommends one male per tank for beginners — the colours are just as stunning solo, and the stress on the fish is far lower.
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emilynakatani
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