Buy another intake tube and swap with the old one. It can't be that expensive. Are there other fish in the same tank? If there are, the babies are dead meat anyway. So when you swap the tube, but it one with the eggs eiterh into a floating net or into another tank.
The first spawn or two often have fertility problems. Angels will try to spawn where there is a little more current, this can cause infertile eggs when the male passes by to fertilize them & the current causes him to miss.