I am not sure, – but yes, I think all fry has these iridescent colours very early on … but you know, its hard to tell with these small fish, if its the same you see each time.
From now on I will try harder to keep an eye on them from the beginning ..
And the age is a guess really, – they are not one cm, – so … they could be 3 weeks, maybe 4, taking into consideration that they are so tiny just after hatching .. but then again, I dont know if they can grow to this size in two weeks ?