yeah once they start ... it takes more to make them stop than anything. Most of my fish don't hold to term successfully on the their first go, and I had a pair of sevs (green tho, not gold) lay eggs a couple of times and they ate them all 4 times.
I blamed tankmates on their reasons for eating them. Too many aggressive fish stressing them I think. If you have yours alone ... I would think a few unsuccessful tries is normal ... and once they get the hang of it, you'll have no problems breeding the sevs
Is Hokey Pokey really what its all about?