Breeding Rams !?!?!?!

[Steph & Dave <caligula@curie.dialix.com.au>]

Hi All

I set up a breeding tank (70 litres, pair of rams and 6 zebra danios)for
my blue rams and they have settled in really well, so well that exactly
seven days after moving them in they have spawned !!

However its now three days later and all the eggs have disappeared -
some time between leaving for work this morning and getting home tonight
(50 - 58 hours after spawning).  All the eggs appeared kinda whitish
this morning which Dave thinks is mold?

Question is what do normal fertilised eggs look like?
why would they go moldy if a) the male appears to spend all his time
hovering and fanning the eggs and b) the water circulation is good.

Any tips or advice appreciated

Thanks

Steph