Amphilophus lyonsi pairing question

[Cichladdict]

I have 4 amphilophus lyonsi and was hoping I might get a pair, not sure on the sex of these fish as ones about 4/5inch and possibly male and other three are quite a bit smaller, if anything there seems to be a bit of bullying going on as the larger one is the boss. Is there any other way of checking sex or ways to help them get on a bit more.
Cheers

 

[Cichladdict]

 

[Rodders02]

Pics if you wouldn't mind? If you post pics I'm sure someone on the forum will be able to identify them for you. I'm sure if you do a quick Google search you can see how to visually sex them or vent them. But you've got four so the chances are you'll get a pair so I'd just wait. How big is the tank? I'm no expert on lyonsi but get a big tank and provide plenty of hiding places. Good luck! Keep us updated if you get a pair

 

[Cichladdict]

That's the larger one I'm guessing is a male but I'm not sure.

 

[Rodders02]

Oh lol posted that at the same time you put a pic up. Lol

 

[Cichladdict]

Will do, cheers. I'll get the others when they keep still.

 

[Cichladdict]

An under belly shot where you can see the business end.

Theres 3 in a 55 and 1 in another 55 but putting them all in a 125 this weekend.
Out of interest do they do ok with geos? Or is it them alone until I get a pair. Plec?

 

[Cichladdict]

 

[Buphy]

Nice looking fish. Can't weigh in on which is which yet but I just ordered my 2 125 gallons for black friday and am on standby for Jeff Rapps to get in juvies. Planning on getting 8 1" ones and letting them pair naturally. Good luck! Hope to be there with you soon!

 

[Cichladdict]

Cheers! Didn't think bet there's tanks going on black Friday. Also them pics above of same fish just not great lighting, got a bulb out but no point replacing as he'll not be in there much longer.