Cleithracara maronii – A Comprehensive Guide (Keyhole Cichlid)
The Keyhole Cichlid, Cleithracara maronii, is one of the most peaceful—and honestly underrated—cichlids you can keep.
At first glance, it’s not flashy:
- Soft tan to silver body
- Subtle patterning
- That signature “keyhole” marking on the side
But spend a little time with them and you’ll realize:
- They’ve got a ton of personality
- They’re interactive without being aggressive
- And they fit into community tanks way better than most cichlids
This is a “slow burn” fish. It doesn’t grab you immediately—but it grows on you fast.
Origin & Habitat
This species comes from northern South America, including Guyana and surrounding regions.
In the wild, they inhabit:
- Slow-moving rivers and streams
- Flooded forest areas
- Heavily vegetated zones
Typical conditions include:
- Warm water
- Soft, slightly acidic parameters
- Leaf litter and submerged wood
Very calm, structure-heavy environments.
Size
- Adult Size: ~4 to 5 inches
- Body Type: Laterally compressed, typical cichlid shape
They’re medium-sized, but not bulky—and they carry themselves in a very calm, controlled way.
Tank Size
- Minimum Tank Size: 30 gallons
- Recommended: 40+ gallons
They do best in:
- Pairs
- Small groups in larger tanks
More space helps reduce stress and allows natural behavior.
Water Parameters
- Temperature: 75–82°F
- pH: 6.0–7.5
- Hardness: Soft to moderately soft
They’re fairly adaptable, but do best in:
- Stable water
- Slightly softer conditions
- Clean environments
Temperament
- Peaceful (for a cichlid)
- Shy, especially at first
- Non-aggressive in most setups
This is not your typical “cichlid attitude” fish.
Important notes
- Can be easily intimidated by aggressive tank mates
- Do best with calm, peaceful species
- May become territorial when breeding
Tank Setup
This is where you really make them comfortable.
Ideal setup
- Planted aquarium
- Driftwood and structure
- Leaf litter or botanicals
- Moderate to low lighting
Why this matters
They are:
- Naturally shy
- Structure-dependent
If the tank is too open:
- They’ll hide
- They’ll stress
- You won’t see their personality
Think:
Calm, covered, natural environment
Diet
Very easy to feed.
Staple foods
- Quality pellets
- Flakes
For best condition
- Frozen foods (bloodworms, brine shrimp)
- Occasional live foods
They’re not picky—but a varied diet helps bring out their best.
Tank Mates
This is where they really shine compared to other cichlids.
Good tank mates
- Tetras
- Corydoras
- Rasboras
- Peaceful dwarf cichlids
- Small to medium peaceful fish
Avoid
- Aggressive cichlids
- Fin-nippers
- Very active or boisterous fish
They do best in calm, balanced communities.
Behavior
- Mid to lower water column
- Calm, deliberate movement
- Social and interactive
They’ll:
- Explore slowly
- Interact with tank mates
- Show subtle but interesting behaviors
They’re not hyperactive—but they’re engaging in a different way.
Breeding
Fairly straightforward compared to many cichlids.
Spawning basics
- Substrate spawners
- Eggs laid on flat surfaces
- Both parents guard eggs and fry
During breeding:
- They become more territorial
- Colors may intensify slightly
They’re actually pretty good parents once they get going.
Why They’re Underrated
Two big reasons:
1. They’re not flashy
They don’t grab attention in store tanks.
2. People expect “typical cichlid behavior”
And skip them because they think:
- Aggressive
- Territorial
When in reality:
They’re one of the most peaceful options available.
Final Thoughts
If you want:
- A peaceful cichlid
- Something with personality but no aggression
- A fish that fits into a community tank
The Keyhole Cichlid is an awesome choice.
It’s not loud—but it’s one of the most enjoyable fish you can keep long-term.
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