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To quote one of my books, "A mildly agressive species that should be maintained in groups of eight to twelve. The aquarium should be at least 75 gallons (300 L) and there should be plenty of rocks piled up to form caves and passageways. Can be kept with smaller, less agressive mbuna."

Sounds like there is meaner out there, be a good community mbuna IMO.
 

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Everyone's experience will differ but mine were a bunch of jerks. I kept 5 of them, and chances are I had 4 males and 1 female, which didn't help. They were constantly lip-locking and chasing other fish around. They're a zebra, which means they act like most other zebras. Not quite as bad as Auratus or Chipokae, but still pretty jerk-like.

If you are going to keep them, keep them in a good sized tank and watch your M-F ratio. Beautiful fish though.
 

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eagl97 said:
How aggressive are Blue Cobalts?
i'm keeping 5, ratios 1m, 3 females and one not sure.
they are housed with mainganos, yellow labs , and yellow tail acei

i'm not having any aggression issues yet, just a bit of chasing, no nipped fins on any fish.
the male maingano is king and he keeps everybody in line.

perhaps i'm going to be lucky with mine, but iv'e had no problems since introducing 4-5 months ago. heck ones holding right now :thumb:
 

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In my experiance, when the dom male is the largest fish in the tank he can be a real bully however with another larger species to keep him in line and a bit of overstocking they are fine.

Phil.
 

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eagl97 said:
How aggressive are Blue Cobalts?
Depends on what they are kept with, the size of the aquarium, the setup of the aquarium and sometimes down to the individual personality of the fish.
 

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I wouldn't attempt to keep more than one male in a 55G. Larger tanks can hold more males, but you would also need adequate female ratios to go with them.

They are one of my all time favourites, and I've never found any of mine to be an aggression problem if housed properly.

Kim
 

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I have 1m/3 f in a 5 foot x 20 inch. The male is very very aggressive, he harasses the 3 females constantly, and also gets in the mood to chase every other fish in the tank, even males that don't resemble him (yellow lab/hongi/acei ngara/demasoni). If there were only two females I'm sure they'd both be dead by now, but for all that he hasn't killed anyone and his shade of blue is just stunning, theres not a blue like it anywhere else in nature.

Eric
 

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Cobalts are the common name

Metriaclima callainos is the scientific name
 
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