Keyhole Sexing

[silverchild23]

Hi

My keyholes have begun to get broody, and I have three males and one female. The female is flirting and the males are getting quite aggressive with each other. They're not tearing each other apart but there's alot of chasing around the tank.

I'm wondering whether it'd be advisable to get another female or two?
If I did - how on earth would I sex them because they seem nigh on impossible to sex when they're small from the LFS?

My tank is as follows:

240L Juwel Rio Tank
Eheim Pro external filter
Tetratec Air Pump with two outlets
Large slate cave
Small pebble area
Large synthetic bog wood
Small synthetic bog wood
Medium Planted.

Fish: 2x Angels, 4x Keyholes, 1x Bristlenose Pleco, 9xTetra (rummynose and cardinal), 1x Blue Ram

Any advice would be appreciated. Many thanks!

 

[england]

i wouldnt bother gettingmore,like you siad its difficult to sex them as juvis,you could end up with all males...well heres my breeding pair
little1 female big is male

male

i would see if any pair of them return the others,unless they dont fight