Splash Tetra
Copella arnoldi
A unique tetra famous for laying its eggs on leaves above the waterline.
| Difficulty | Intermediate |
| Min. Tank Size | 75 L |
| Temperature | 23.0–28.0 °C |
| pH Range | 5.5–7.0 |
| Max Size | 6.0 cm |
| Lifespan | 3-5 years |
| Diet | Carnivore |
| Temperament | Peaceful |
Overview
The Splash Tetra (Copella arnoldi) is a unique tetra famous for laying its eggs on leaves above the waterline. It is a popular choice among Australian aquarists, reaching around 6 cm and living roughly 3-5 years when properly cared for.
This complete guide covers how to keep the Splash Tetra successfully - tank size and setup, water parameters, the best foods (including recommended brands), suitable tank mates, breeding, sexing and the health issues to watch for. It is rated Intermediate to care for.
Natural Habitat & Origin
Tetras come from the warm, soft, acidic blackwater rivers and flooded forests of South America, where light filters dimly through the canopy and tannins stain the water like tea. Subdued lighting, dark substrate, driftwood and live plants recreate this and bring out their colours.
Matching the temperature, water chemistry and cover a species evolved with is the simplest route to keeping it healthy and seeing its natural behaviour and colour.
Tank Size & Aquarium Setup
Provide a minimum of 75 litres for the Splash Tetra. As a group-living species, swimming length and floor space matter more than height.
Live plants, driftwood and shaded retreats give security and show off the fish's colours against a natural backdrop.
Always add fish only to a fully cycled, mature tank with stable biological filtration. Match filtration generously to the fish's size and waste output.
Water Parameters
Keep the Splash Tetra in stable water at 23-28 °C with a pH of 5.5-7.0. Soft, acidic water suits it best and is important for colour and breeding.
Test regularly: ammonia and nitrite must read zero, and nitrate should be kept low with routine partial water changes. Always dechlorinate and temperature-match new water, because sudden swings cause far more illness than water that is stable but slightly imperfect.
Diet & Feeding
The Splash Tetra is a carnivore and needs a protein-rich, meaty diet.
In Australia, good options include Hikari Carnivore pellets or Vibra Bites, plus Dymax frozen bloodworm, daphnia and brine shrimp. Feed small amounts once or twice a day (only what is cleared in a minute or two), vary the diet for the best colour and health, and avoid overfeeding, which is the leading cause of poor water quality.
Temperament & Tank Mates
The Splash Tetra is peaceful and community-friendly. It mixes well with other calm species that share its temperature (23-28 °C) and pH (5.5-7.0) needs, are too large to be eaten and not large enough to eat it.
It is happiest in a group of its own kind and is shyer and less settled when kept alone.
Breeding
The Splash Tetra is an egg-scattering species. To breed it, condition a group on rich foods, then move them to a dim tank with fine-leaved plants or a spawning mop; the parents scatter eggs and will eat them, so remove the adults after spawning.
Even if you are not planning to breed it, recognising this behaviour helps you understand what you are seeing and respond well - for example by adding cover for fry or giving a guarding pair extra space.
How to Tell Males from Females
Females are usually rounder and fuller-bodied, especially when carrying eggs, while males tend to be slimmer and a little more intensely coloured.
Common Health Problems
Like most aquarium species it can suffer from white spot (ich), fin rot and fungal or bacterial infections, almost always triggered by stress or poor water quality. Quarantine new arrivals for 2-4 weeks and watch daily for early signs such as loss of appetite, unusual hiding, clamped fins or laboured breathing - caught early, most issues are very treatable.
Prevention beats cure: keep water pristine, avoid overstocking and overfeeding, quarantine new arrivals, and act at the first sign of trouble.
Is the Splash Tetra Right for You?
The Splash Tetra suits keepers with some experience and a stable, mature, appropriately sized tank, as long as you can provide at least 75 litres, water at 23-28 °C and pH 5.5-7.0, the right diet and a proper group of its own kind.
Meet those needs and the Splash Tetra will reward you for around 3-5 years. Use our free aquarium calculators to plan your setup, and explore our other fish, plant and disease guides to build a thriving aquarium.
