Orange Line Chromis (Acanthochromis Polyacanthus)
Orange Line Chromis (Acanthochromis polyacanthus)
The Orange Line Chromis, more commonly known in the hobby as the Spiny Chromis or Monochrome Damselfish, is a fascinating outlier in the world of marine fish. While most damselfish and chromis broadcast their eggs into the current to drift away, this species is famous for being one of the only marine fish to provide full parental care, guarding their fry in the aquarium much like freshwater Cichlids.
Key Information
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Common Names: Orange Line Chromis, Spiny Chromis, Spiny Devil, Monochrome Damsel
-
Scientific Name: Acanthochromis polyacanthus
-
Origin: Western Pacific (Indonesia, Philippines, Great Barrier Reef)
-
Max Size: 12–14 cm (approx. 5 inches)
-
Lifespan: 8–12 years
-
Temperament: Semi-aggressive; territorial (especially when breeding)
-
Diet: Omnivore – Primarily a planktivore
-
Care Level: Very Easy
Appearance & Identification
This fish is unique because its appearance varies wildly depending on its geographic origin. In the Indonesian trade, you will see a few different "morphs":
-
The "Orange Line" Phase: Juveniles often feature bright orange or yellow horizontal stripes along a dark grey or black body.
-
The Adult Shift: As they mature, many lose the orange lines and become solid charcoal grey, chocolate brown, or even bicolor (white back half, dark front half).
-
The Fins: They have a more "rugged" look than the slender Blue Green Chromis, with a stockier body and a prominent, spiny dorsal fin.
Behaviour & Tank Compatibility
-
The "Cichlid" of the Sea: Their behavior is remarkably similar to African Cichlids. They claim a territory, aggressively defend it, and—most interestingly—the parents will shepherd their young in a tight cloud, fending off any fish that get too close.
-
Aggression Level: They are bolder and more aggressive than the common Blue Green Chromis (Chromis viridis). They can be "bullies" in small tanks, especially toward other mid-water swimmers.
-
Reef Safe: 100% Reef Safe. They do not bother corals or invertebrates.
-
Social Structure: Can be kept in a mated pair or as a single specimen. Unlike other chromis, they do not necessarily need to be in a large school to feel secure.
-
Tank Mates: Best kept with similarly sized or larger fish like Tangs, larger Wrasses, and Angelfish. Avoid keeping them with very shy or delicate species.
Ideal Tank Setup
-
Tank Size: A minimum of 115L (30 Gallons) for a single fish, but 200L+ (55 Gallons) is recommended if you want to witness their unique breeding behavior.
-
Rockwork: Provide plenty of caves and vertical surfaces. They prefer to lay their eggs on flat rock surfaces inside a protected cave.
-
Water Flow: They enjoy moderate to high flow. They are strong swimmers and are usually found on reef slopes and faces where the current is steady.
-
Hardiness: These are exceptionally tough fish. They are very resistant to disease and can handle minor fluctuations in water parameters, making them great for hobbyists of all levels.
Dietary Needs
They are eager, enthusiastic eaters:
-
Diet: Offer a variety of meaty frozen foods (mysis, brine shrimp) and high-quality flakes or pellets.
-
Frequency: Feed 1–2 times daily. They have a high metabolism and appreciate frequent, small feedings.
Why Choose the Orange Line Chromis?
The Orange Line Chromis is for the hobbyist who wants a "behavioral" fish. While it lacks the neon blue of other chromis, its unique parental care and "tough guy" personality make it a fascinating study. If you are interested in breeding marine fish, this is arguably the easiest species to start with, as they do most of the hard work for you by protecting the fry until they are large enough to fend for themselves.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Orange Line Chromis (Acanthochromis Polyacanthus)
Orange Line Chromis (Acanthochromis Polyacanthus)
Orange Line Chromis (Acanthochromis polyacanthus)
The Orange Line Chromis, more commonly known in the hobby as the Spiny Chromis or Monochrome Damselfish, is a fascinating outlier in the world of marine fish. While most damselfish and chromis broadcast their eggs into the current to drift away, this species is famous for being one of the only marine fish to provide full parental care, guarding their fry in the aquarium much like freshwater Cichlids.
Key Information
-
Common Names: Orange Line Chromis, Spiny Chromis, Spiny Devil, Monochrome Damsel
-
Scientific Name: Acanthochromis polyacanthus
-
Origin: Western Pacific (Indonesia, Philippines, Great Barrier Reef)
-
Max Size: 12–14 cm (approx. 5 inches)
-
Lifespan: 8–12 years
-
Temperament: Semi-aggressive; territorial (especially when breeding)
-
Diet: Omnivore – Primarily a planktivore
-
Care Level: Very Easy
Appearance & Identification
This fish is unique because its appearance varies wildly depending on its geographic origin. In the Indonesian trade, you will see a few different "morphs":
-
The "Orange Line" Phase: Juveniles often feature bright orange or yellow horizontal stripes along a dark grey or black body.
-
The Adult Shift: As they mature, many lose the orange lines and become solid charcoal grey, chocolate brown, or even bicolor (white back half, dark front half).
-
The Fins: They have a more "rugged" look than the slender Blue Green Chromis, with a stockier body and a prominent, spiny dorsal fin.
Behaviour & Tank Compatibility
-
The "Cichlid" of the Sea: Their behavior is remarkably similar to African Cichlids. They claim a territory, aggressively defend it, and—most interestingly—the parents will shepherd their young in a tight cloud, fending off any fish that get too close.
-
Aggression Level: They are bolder and more aggressive than the common Blue Green Chromis (Chromis viridis). They can be "bullies" in small tanks, especially toward other mid-water swimmers.
-
Reef Safe: 100% Reef Safe. They do not bother corals or invertebrates.
-
Social Structure: Can be kept in a mated pair or as a single specimen. Unlike other chromis, they do not necessarily need to be in a large school to feel secure.
-
Tank Mates: Best kept with similarly sized or larger fish like Tangs, larger Wrasses, and Angelfish. Avoid keeping them with very shy or delicate species.
Ideal Tank Setup
-
Tank Size: A minimum of 115L (30 Gallons) for a single fish, but 200L+ (55 Gallons) is recommended if you want to witness their unique breeding behavior.
-
Rockwork: Provide plenty of caves and vertical surfaces. They prefer to lay their eggs on flat rock surfaces inside a protected cave.
-
Water Flow: They enjoy moderate to high flow. They are strong swimmers and are usually found on reef slopes and faces where the current is steady.
-
Hardiness: These are exceptionally tough fish. They are very resistant to disease and can handle minor fluctuations in water parameters, making them great for hobbyists of all levels.
Dietary Needs
They are eager, enthusiastic eaters:
-
Diet: Offer a variety of meaty frozen foods (mysis, brine shrimp) and high-quality flakes or pellets.
-
Frequency: Feed 1–2 times daily. They have a high metabolism and appreciate frequent, small feedings.
Why Choose the Orange Line Chromis?
The Orange Line Chromis is for the hobbyist who wants a "behavioral" fish. While it lacks the neon blue of other chromis, its unique parental care and "tough guy" personality make it a fascinating study. If you are interested in breeding marine fish, this is arguably the easiest species to start with, as they do most of the hard work for you by protecting the fry until they are large enough to fend for themselves.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
Orange Line Chromis (Acanthochromis polyacanthus)
The Orange Line Chromis, more commonly known in the hobby as the Spiny Chromis or Monochrome Damselfish, is a fascinating outlier in the world of marine fish. While most damselfish and chromis broadcast their eggs into the current to drift away, this species is famous for being one of the only marine fish to provide full parental care, guarding their fry in the aquarium much like freshwater Cichlids.
Key Information
-
Common Names: Orange Line Chromis, Spiny Chromis, Spiny Devil, Monochrome Damsel
-
Scientific Name: Acanthochromis polyacanthus
-
Origin: Western Pacific (Indonesia, Philippines, Great Barrier Reef)
-
Max Size: 12–14 cm (approx. 5 inches)
-
Lifespan: 8–12 years
-
Temperament: Semi-aggressive; territorial (especially when breeding)
-
Diet: Omnivore – Primarily a planktivore
-
Care Level: Very Easy
Appearance & Identification
This fish is unique because its appearance varies wildly depending on its geographic origin. In the Indonesian trade, you will see a few different "morphs":
-
The "Orange Line" Phase: Juveniles often feature bright orange or yellow horizontal stripes along a dark grey or black body.
-
The Adult Shift: As they mature, many lose the orange lines and become solid charcoal grey, chocolate brown, or even bicolor (white back half, dark front half).
-
The Fins: They have a more "rugged" look than the slender Blue Green Chromis, with a stockier body and a prominent, spiny dorsal fin.
Behaviour & Tank Compatibility
-
The "Cichlid" of the Sea: Their behavior is remarkably similar to African Cichlids. They claim a territory, aggressively defend it, and—most interestingly—the parents will shepherd their young in a tight cloud, fending off any fish that get too close.
-
Aggression Level: They are bolder and more aggressive than the common Blue Green Chromis (Chromis viridis). They can be "bullies" in small tanks, especially toward other mid-water swimmers.
-
Reef Safe: 100% Reef Safe. They do not bother corals or invertebrates.
-
Social Structure: Can be kept in a mated pair or as a single specimen. Unlike other chromis, they do not necessarily need to be in a large school to feel secure.
-
Tank Mates: Best kept with similarly sized or larger fish like Tangs, larger Wrasses, and Angelfish. Avoid keeping them with very shy or delicate species.
Ideal Tank Setup
-
Tank Size: A minimum of 115L (30 Gallons) for a single fish, but 200L+ (55 Gallons) is recommended if you want to witness their unique breeding behavior.
-
Rockwork: Provide plenty of caves and vertical surfaces. They prefer to lay their eggs on flat rock surfaces inside a protected cave.
-
Water Flow: They enjoy moderate to high flow. They are strong swimmers and are usually found on reef slopes and faces where the current is steady.
-
Hardiness: These are exceptionally tough fish. They are very resistant to disease and can handle minor fluctuations in water parameters, making them great for hobbyists of all levels.
Dietary Needs
They are eager, enthusiastic eaters:
-
Diet: Offer a variety of meaty frozen foods (mysis, brine shrimp) and high-quality flakes or pellets.
-
Frequency: Feed 1–2 times daily. They have a high metabolism and appreciate frequent, small feedings.
Why Choose the Orange Line Chromis?
The Orange Line Chromis is for the hobbyist who wants a "behavioral" fish. While it lacks the neon blue of other chromis, its unique parental care and "tough guy" personality make it a fascinating study. If you are interested in breeding marine fish, this is arguably the easiest species to start with, as they do most of the hard work for you by protecting the fry until they are large enough to fend for themselves.
