Sexing my Apistogramma help please!

[Ridderz65]

I have what I believe to be 4 Apistogramma Panduro.

I was lead to believe I had bought 1 male and 3 females, but I'm really not sure that is the case. Please can someone identify the four fish from the pictures? Thank you!

 

[MacZ]

1: female or sneaker male
2: female
3: male
4: female

1 and 4 have unusually bulging and dark eyes, they might be on the brink of falling sick.