Sexual dimorphism identification of Chelmon rostratus, the Copperband Butterfly,

[OrionN]

Yes I agree.

 

[exnisstech]

I still think my two look like M and F so I decided to have another go after the failure noted in post #92. This time I modified a reptile carrier into an acclimation box. I left the box in the tank over a week. I fed the box first every day so the new guy would get food and it also worked out well getting him used to all the other fish at feeding time since they were trying to get to the food.

I ended up taking the lid off and setting the box on the rocks. The resident CBB swam in to the box and a few minutes later they both swam out.
It's only been 24 hours but I've seen zero aggresion towards the new guy and he is has no trouble competing for food. Fingers crossed it continues.

 

[Tub Life]

What's your guys' thoughts, male or female. It's about 2-2.5"

 

[OrionN]

What's your guys' thoughts, male or female. It's about 2-2.5"

This fish look like a male to me
Here is the profile of a female:

Profile of a male

 

[Tub Life]

Thanks for your input!

Unfortunately, my LFS doesn't have any more in stock atm.
So if I do proceed with trying to pair up CBBs, it will have to happen in the display as I'll be releasing the little "male" out of observation soon.

So, I gather I would want a smaller female? In this case, waiting isn't so bad as the current male is still young/small. Waiting to find another suitable female will give the "male" some time to grow, he has already put on some weight, as he was a touch thin upon me acquiring him.