Copella Arnoldi (Splash Tetra) Advice

[i3lade4life]

I have a group of 3 splash tetra presumably 2M 1F. They do a lot of jumping on the side of the glass but I never seem to get any eggs anymore. I had some very successful breeds about 9 months ago. But nothing for ages. Getting another female is proving to be impossible as nowhere seems to stock them.
Any advice is welcome

 

[Tongue_Flicker]

Try putting a slanted slab of glass, slate rock, hanging plants like photos. Slightly dim your tank and warm the water a bit also to stimulate breeding. Global warming and climate change is affecting the way our pets behave nowadays

 

[i3lade4life]

Already got overhanging plants. I really dont think the problem is down to the water as they are going through all of the breeding behaviour (i.e jumping). Maybe I have a barren female 

 

[Tongue_Flicker]

How old are they? It is possible they are way too old or are out of their fertile stage now