Thanks yeah I left them with the parent for quite a while. Funny you said only the male would hold yours.. In my pair only the female would hold them.
I initially had 20ish but they are now down to 7 strong little 1cm fish that are now separated from the parents and doing well. Parents are slowly getting ready for next spawn I think which I hope will be more successful. The first spawn was very awkward. Female trying to attach the eggs to the bottom glass (not very successful) and the male doing his stuff up against a rock. Not very coordinated, hehe. hence the very low hatch rate.
As for swapping I am certainly not against it but just think all our fish most likely comes from the same source (perhaps even pair) overseas so would not create much genetic diversity anyway no matter how much we swap around.