Sexing Sydontis Multipunctatus

[katatoniq]

A quick one: I have three 3-4cm multis for the first time. My mate who gave them to me said that there's definitely one male and two females. How do I know for sure?

The only difference I can tell so far is that the biggest one has a brown "background" with the darker brown spots, where as the other two are smaller and have a greyish background with the same colour spots.

Any help and other info on these little cuties would be greatly appreciated.

Cheers

 

[spikeyboy]

You will have to vent them or ask your mate how they new they were definatly 1m/2f.

 

[MartinS]

On mature fish, you may be able to see a genital 'spike' on the male (around the anal opening) - there is not one on the female.
If you post some photos, then maybe someone can help further.
Martin