Cool pics ozwald. Especially like their tank!
Mine are at about the same stage as yours, and are still being fed feeder eggs. Whilst feeding the parents bloodworm I noticed some of the fry eating them!!! I've tried feeding them freeze dried artemia, and crushed hikari carnivore pellets just to see if they'd take them (which they did) but stopped because 'mothers milk' has got to be more nutritious than any prepared stuff? You shouldn't have too much trouble converting them, but try and vary it so they don't get stuck on just one type of food. Feeding three times a day is recommended for the young. Good luck with them.