Green Terror

Green Terror key facts

Care level

Intermediate

Lifespan

8-12 years

Size

20-30cm

Temperature

20〜24℃

Diet

Cichlid pellets, earthworms, prawn, mussel, vegetables

Tank

150 x 45cm (about 304 litres) or larger; over 650 litres if it is to be kept with other fish. Use rockwork to divide territories.

Water Temperature & Quality

20-24C, pH 6.5-8.0, 5-25 dGH.

Tank Mates

Aggressive, so best kept alone or as a pair. Only in a very large tank can it join robust cichlids, large catfish and loricariids.

Diet & Feeding

Base the diet on quality cichlid pellets with earthworms, prawn, mussel and vegetables. Avoid high-fat foods such as beefheart.

Breeding & Spawning

A substrate spawner producing up to 400 eggs. They hatch in three to four days, fry swim free after six to eight, and parents guard them for about six weeks.

Health & Notes

Males may harass females even within a pair. Provide refuges and separate them with a divider if needed.

About Green Terror

The Green Terror is a striking South American cichlid with a metallic blue-green body, growing 20–30 cm. Territorial by nature, it's typically kept alone or in pairs and suits intermediate keepers.

7 things to know before welcoming a Green Terror

1. 1Tank Size for a Growing Body

   Adults grow to 20–30 cm, making this a large cichlid. A cramped tank causes stress, so plan ahead and provide plenty of swimming room as it matures.

2. 2Strong Territorial Instinct

   True to its name, this fish is bold and highly territorial. Keeping it alone or as a single pair is standard; any tankmates should be similarly sized and equally sturdy.

3. 3Not Suited to Small Tankmates

   Its assertive temperament means small, peaceful fish can easily become targets. Choose tankmates with a similar size and an equally confident personality.

4. 4A Tendency to Dig

   Like many cichlids, it likes to dig through the substrate. Rocks and driftwood can topple as a result, so avoid unstable decor or secure it firmly.

5. 5Hardy, But Water Quality Still Matters

   While fairly hardy overall, it can be sensitive to declining water quality. Regular water changes and well-maintained filtration are key to keeping it long term.

6. 6An Easy Omnivorous Eater

   This omnivore readily accepts everything from pellets to frozen foods, so feeding is rarely a challenge. Just watch for overfeeding, which can quickly foul the water.

7. 7Changes in Appearance With Age

   Mature males often develop a nuchal hump on the forehead as they grow. It's also worth knowing that temperament tends to intensify once a pair forms.

Frequently asked questions about Green Terror

Q.Can Green Terrors be kept with other fish?

A.Their bold, territorial nature makes them a poor match for small, peaceful fish. If you do mix species, choose similarly sized, sturdy fish and provide plenty of space and hiding spots in the tank.

Q.Is this a good fish for beginners?

A.This species is generally considered suitable for intermediate keepers. Some prior experience with water quality management and larger fish will help you care for it confidently.

Q.How large a tank does it need?

A.As an adult reaching 20–30 cm, it needs a spacious tank sized for its full-grown length. A cramped setup can lead to stress and aggression problems.

Q.Should I keep a single fish or a pair?

A.Because it's so territorial, keeping it alone or as a single pair is the standard approach. Housing multiple individuals together often leads to fighting over dominance.

Q.How can I tell males and females apart?

A.Mature males typically develop a bump on the forehead and longer fins. Females tend to stay smaller and more compact, though individual variation means it's best to judge based on how each fish develops.

Useful tools for Green Terror care

Learn more about Green Terror in the encyclopedia

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