Is It Possible To Sex My Harlequins From This Photo?

[daizeUK]

Here's four of my harlequins... if anyone can determine their sex, can you explain to me how to tell?
 

 

[daizeUK]

I found these pictures
 

I think the top three in my picture look female but the slightly larger one at the bottom I'm not too sure. I've also got another harlequin not pictured who is slightly bigger and more brightly coloured and I'm pretty sure he's male.

 

[Ch4rlie]

Sorry, but I have no idea if they're males or females, but what a great pic!
 
Especially like that one on top right with green eyes watching you. lol 

 

[daizeUK]

That's a photobomb threadfin lol

 

[Ch4rlie]

That's a photobomb threadfin lol

 
Even better!