I have 7 in a 40 gallon, I've had eggs but I've had them get to fry, I'm jealous! I did do a lot of reading and it seems like if you want to raise the fry you'll eventually have to move them anyway. If it were me I would setup a grow out tank and use a turkey baser to remove half of the fry and leave the other half with the parents and see what happens. I'm no expert and I'm not sure if removing some of the fry would cause the parents to stress and eat the rest or not.
for food I would get a starter of microworms, they're really easy to maintain and should be small enough for the fry.