I think they would be ok with each other but really should have some rock work to be able to hide in, a tank that size isnt going to allow that and might just lead to aggression between them. I think you should either take the chance with them in your main tank or up the size of your breeding tank.
Having looked into the feeding a little more, you can drop a little food in once every week or so (esp in the last few weeks). they may or may not eat it so you should remove anything that is uneaten.