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Discussion Starter · #1 ·
I have 5 Cobalt blue (Metriaclima callainos) I only have them a month. I'm wondering if I can tell the sex yet. I have two that are more blue than the rest and they both have a pronounced white spot on the back fin. One is already the tank boss to an extent. Can I assume these are males?
 

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Discussion Starter · #3 ·
Those two that I believe are males seem to be vying for something. Every once in a while they will be in a sort of stand off mode. Is this the aggression that I've been warned of? And I guess the reason to have 1m4f?
 

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Yes, that seems like a likely male. One or two males rise to the top of the pecking order. A dominant male will be lighter, nicer blue with longer pointed fins and more distinct eggspots. Female mbuna can have a weak eggspot or two but if fish are in a group for awhile, males will rise to be bosses and have more distinct eggspots.

You may have two males, or even more. It is just natural in a pecking order that you get one leader alpha, then a beta (2nd) to challenge the boss. If you have two males, they may fight alot for dominance which is why you want 1 male in a small group, the "dictator" always wants to chase away his closest competitor... but in a closed tank the challenger can't leave unless you take him out, so it can be constant war.
 
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