You could turn the filter off if you want. Angels are a cichlid and they usually make very good parents. They will keep other fish away from the babies usually. However angels are also pretty "skittish" when it comes to spawning, any little change in their enviornment could turn them into egg cannibals. Its not suprising if this whole batch is not properly fertilized, your male probably has not yet learned to follow the female. If you get a chance to watch them spawn you'll notice that the female will go up and down the chosen spot with her fins trailing on it. This is for her to get a feel on where she needs to position her body in relation to the spawning slate. The males job is to closely follow behind her to fertilize the eggs she just laid. The male needs practice to successfully do this. He ends up shooting his stuff everywhere but on the eggs

Id give them 2-3 more chances before you start thinking of removing the eggs.
How often they will spawn depends on how much time you have to put into the fish. Angels thrive on frequent water changes. And by frequent I mean daily, not weekly. Usually 30% a day is optimum. If you can not change at least 50% 1x a week you will not be able to successfully breed them. On daily water changes they will usually spawn between 14-18 days. If they are still raising the fry themselves it will take longer.
If you do decide to move the eggs her is the set-up I use: a 1 gal. glass canning jar with 1 airstoe in it. remove the spawning slate and tilt it so that the air is moving directly ofer the eggs. Add enough methyl blue to turn the water a bluish tint. change 25% of the water every day. Leave them in their from the egg stage and wiggler stage. Remove them and put them in a 5 gal tank when they are free swimming. At this point you start to feed them. I use baby brine shrimp 5x a day (little often) after about 2-3 wks I start to add finely crushed flake at every other feeding. If you continue to do the daily water changes and cull out the unwanted babies you should have a nice looking group of angels ready to sell at around 2 months of age.
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Candice