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Overview
The Six-Line Wrasse is a small, energetic reef fish known for its bright stripes, constant movement, and curious “hunter” behavior. It weaves through rockwork all day picking at tiny pests and microfauna, which is part of why it’s so popular. In the right tank, a Six-Line can be a lively, helpful addition that adds nonstop activity and personality.
The trade-off is temperament. Six-Lines can become territorial as they mature—especially in smaller tanks or in tanks with other similar-shaped fish. Many hobbyists love them early on, then struggle later when the wrasse decides it’s the boss. If you go in with the right expectations and plan your tankmates carefully, you can have a great experience with this fish.
Quick Care Snapshot
Reef Safe: Yes
Difficulty: Easy to Moderate (compatibility is the main challenge)
Temperament: Semi-aggressive to aggressive (often increases with age)
Minimum Tank Size: 30 gallons (55+ recommended for smoother community dynamics)
Best Kept As: Single
Diet: Carnivore (easy eater; natural hunter)
Water Conditions: Stable reef parameters
Special Note: Needs rockwork to hunt and retreat; can be a bully in small tanks
Natural Background
Six-Line Wrasses live among reef rock and rubble where they spend their day hunting tiny crustaceans, worms, and other small food items. They’re fast, alert, and always scanning the tank. That hunting instinct is what makes them fun to watch—and also what makes them prone to “policing” the tank and chasing fish they don’t like.
In aquariums, they rely heavily on rockwork for:
• hunting behavior (their natural routine)
• shelter when startled
• a territory they can claim
A Six-Line without enough structure often becomes more stressed and more aggressive.
Tank Requirements
Tank size & layout
• 30 gallons minimum, but larger tanks make them easier to manage.
• 55+ gallons is a much better environment if you want a peaceful community with multiple fish.
• Provide plenty of live rock and crevices—they spend most of their time weaving through it.
Lid / jumping
Wrasses can jump, especially when startled.
• A lid or mesh screen top is strongly recommended.
Sand bed (helpful)
Six-Lines often sleep in rock crevices, but a sand bed can still be beneficial for overall tank stability and natural behavior. It’s not required, but it helps create a more “complete” reef environment.
Flow & lighting
• Flow: Moderate to strong is fine as long as there are calmer zones in the rockwork.
• Lighting: Not demanding for the fish.
Feeding
Six-Line Wrasses are usually excellent eaters.
What to feed
They do well on:
• quality pellets (small size)
• frozen foods:
• mysis shrimp
• enriched brine shrimp
• finely chopped marine blends
Feeding behavior
They’ll hunt all day, but they still need regular feedings. A well-fed Six-Line is often less aggressive than a hungry one.
How often
• Once daily can work in a mature tank with natural microfauna.
• Twice daily small feedings is often better in busy community tanks to keep them satisfied and less cranky.
Compatibility
This is the section that matters most for Six-Lines.
Good tankmates (generally)
They often do well with:
• larger, confident community fish that won’t be easily bullied
• fish that occupy different zones (open water vs rockwork)
• peaceful fish in larger tanks where territory is less tight
Watch-outs
Six-Lines commonly cause issues with:
• other wrasses (especially in smaller tanks)
• timid gobies or firefish
• new additions introduced after the Six-Line is established
• similarly shaped or similarly “rockwork-oriented” fish
The “boss fish” problem
Many Six-Lines start off fine, then become territorial as they mature. This isn’t guaranteed, but it’s common enough that you should plan around it.
Reef compatibility
They are reef safe with corals and invertebrates in most cases. They may hunt tiny microfauna, which is normal. They can be helpful against some small pests, but don’t treat them as a guaranteed pest-control solution.
Common Mistakes
1) Adding a Six-Line too early in stocking order
If a Six-Line becomes established first, it may aggressively “claim” the rockwork and bully later additions. They often do better as one of the last fish added.
2) Keeping one in a small tank and expecting perfect peace
In tight spaces, territory becomes intense. Larger tanks make this fish much easier.
3) Mixing with other wrasses or similar fish without a plan
Wrasse-on-wrasse conflict is common. Unless you have a larger tank and careful compatibility planning, keep it as your only wrasse.
4) Ignoring early warning signs
Chasing, cornering, and fin-nipping often start subtle. If it’s escalating, it rarely improves on its own.
5) Assuming it will solve pest problems
They may help with some pests, but they won’t fix root causes. Choose the fish because you want the fish—not because you want a “tool.”
Notes & Variations
Common names
- Six-Line Wrasse
- Sixstripe Wrasse (sometimes used)
Scientific name
- Pseudocheilinus hexataenia
Behavior notes
• Constant rockwork patrol is normal.
• They sleep by wedging into rock crevices.
• They may disappear early on or at night—normal wrasse behavior.
Practical tip
If you want a Six-Line, think of it as a “high-energy personality fish.” In the right tank, that’s great. In the wrong tank, it becomes the source of your biggest fish drama.
Final Thoughts
The Six-Line Wrasse is a beautiful, active reef fish that adds nonstop life to a tank and often helps keep small unwanted critters in check. The key to success is planning: give it rockwork, use a lid, feed it well, and be realistic about temperament—especially as it matures. If you stock thoughtfully and provide enough space, a Six-Line can be a fun, vibrant part of a reef community. If you cram it into a small, peaceful tank and hope for the best, it may eventually decide it owns the place.