firemouths and green terrors breeding

Question
i have 1 55 gallon tank with green-terrors in it and i am trying to find a pair we had a pair before and they had 2 batches of babies and now they won't do anything am i doing something wrong? how do you tell the difference between male and female.
Fire-mouths same thing

Answer
Hi Linda;

Maybe they don't like each other and aren't bonded, or aren't mature enough to breed?
Or, perhaps they aren't established enough yet?
How long have you had the tank set up?
Could the tank be still in the break-in period and the toxins are preventing them from feeling like breeding?
Do you make weekly 25% water changes and gravel vacuumings?

Males have pointed fins and get more color. Mature males get a hump on their heads. Females are smaller, have rounder fins and are more plain looking.

Here are profiles of them;

http://www.malawicichlidhomepage.com/other/aequidens_rivulatus.html
http://www.fishprofiles.com/files/profiles/371.htm
http://www.thetropicaltank.co.uk/Fishindx/greenter.htm
http://badmanstropicalfish.com/profiles/profile61.html

At Your Service;
Chris Robbins