Have they given me a female? Please help me sex my Endler

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AbbyLou94

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I have an established planted tank with all male Endlers, I bought some more fish today from the same place as before and was reassured they are all males as they don’t keep females. I was a bit confused because the first time I bought the fish the guy spent ages fishing out only males but now they don’t keep females ?
One of the fish are significantly larger than the others, has almost no markings and a different shaped tail. Ive also noticed the others follow it around but maybe that’s because it’s the largest so it’s the alpha male? Or is it a female? I’ve googled it but it doesn’t look like a female for certain but I hate to think I’ve got 1 female among all those males because she’d be miserable.

I’ve attached a pic, please let me know what you think
 

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They're all male chili endlers. Not all males will have a nice looking short doublesword. That's quite normal. Sometimes you'll even see a male with a closed colored tail instead of a short doublesword.
And yes, not all males will reach the same size. Also quite normal. With endlers (in this case endler hybrids) the size doesn't say anything about dominance. But the colors will say something about the dominance. The more intense the coloration and markings, the more dominant the male.
 
Great thank you! They’re been together in the tank for 8 hours now and they still follow him around but I haven’t seen any nipping or signs of aggression. Do you think after a while this will stop? Is it likely to be distressing him?
 
Great thank you! They’re been together in the tank for 8 hours now and they still follow him around but I haven’t seen any nipping or signs of aggression. Do you think after a while this will stop? Is it likely to be distressing him?
It's a late male. And males tend to see late males as being females for a while. Give it some time. It will mostly pass. At some point he knows he's a male as well and he'll get the same behavior.
 
You sex them the same way you sex mollies, guppies and platies. Look at the anal (bottom) fin. Males have a long thin anal fin called a gonopodium. Females have a fan or triangle shaped anal fin.
 

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