Since those used to be my fish, i know them pretty well. Here is what i suggest you do.
It is okay to feed them now but they will not eat in front of you, no matter what. Put something in there and leave the room for about an hour. If the food is not gone, remove it. This is how i used to feed them. I recommend any of the following. Shrimp, chicken, catfish fillets, and Hikari foodsticks because these are what i've been feeding them. (sacrafice the kissing gourami)
That 5 incher has been non-aggressive ever since he hatched. You'll notice the larger of the 3 inchers picking on him from time to time. Dun worry about them getting along, they have been living together for almost 2 months now. I do suggest you getting a bigger tank though, because they have been living in a 55 gallon before i gave them to you.
It took them 2 weeks to get used to me. Keep the lights dim and dun startle them too much. They had to sit in the car for a whole 2 hours. They may have gotten carsick, just give them lots of time and patience and they will be the most awesome fish you ever owned.