hi freshwaterfishlover
well it could be a number of things from
1) are you show there male and female
2) are they sexualy muture
3)they need conditioning for at least 2 weeks on high protine food ,pellit,any live foods they can eat,flake ,frozen foods ,give them more food than usally and do more water changes than usally but take uneated food out the next day .
now after the 2 weeks if they havent spawned natrually do a 10%water change and add cold water do that every 2 days till they spawn ,i did this till my bronze spawned and now they spawn every week like clock work ,just got about 300 eggs today ,pluss i have 150 wriglers from last week and 80 from a month ago
when there ready theyll act differnt shooting back and frow up the glass and chaceing each other
make show you take the eggs out or they will eat them , i do it with my finger but they are really tricky to get off the glass some times, and easly damaged so take ure time i stick the eggs to a container which i float in the tank with a bit of meth blue to stop fungus with an air stone dangled in it for water circulation, they will hatch from 2-4 days thats the easy part raising them is the hardest ,the first 24hours or so you dont need to feed them ass they live off the egg york
best food for them is newly hatched bbs and micro worms but iv feed mine liqufry and first bights with no probs make sure you keep the container clean and take uneated foods out and you sholdent have any probs
good luck