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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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