First, afras are not pair fish (in essence all the fish we think of from malawi are 1 male to say 3-4 females). The male will likely kill likely huras the female to death.
I honestly wouldn't try breeding in anything less than a 55 or 40 long.
Put in lots of rocks leave the temp ~79 degrees. Water parameters really don't mater as long as ph ~7.8. If you have really soft water use the premixed salts/malawi mixes (not required just increases chances, not like you will need it with a male and 3 females.)
That would be all you need.
I am not saying that it can't be done in a 10. I have seen people breed angles in 5 gallons so there is never a set rule. But the fish will be much happier in a larger tank. OH and lots of rock work is a must. Make sure the females can hide from the male.
Anyways these guys will breed like mad if they are happy, but don't be surprised if your fist couple of batches aren't held through all the way.