Exactly my plan, however its tough to take the slate to another warm hatching tank if the male eats the eggs as soon as the female lays them
I'm not concerned really...the first few spawns are usually pretty pathetic with young angelfish pairs, and the eggs often get eaten prior to being able to remove the slate to a safer location. However I now have 3 pairs from the 9 nickel sized angels I imported in early October, two standard fin pairs and a veil tail pair. But the fish are only about 5 1/2 to 6 months old, so it won't be for a few more weeks that the pairs should start to stabilize a bit. I used to breed angelfish for fun years ago when I lived in Toronto, and this happened all the time with new, young pairs as I recall. Once they have a few spawns under their belt they don't eat the eggs immediately, and then you have a chance to take out the slate and hatch artificially.
And Driftwood, I'm not sure why I was charged GST....I was only over the border for 20 minutes picking up my fish, and maybe you have to be in the USA longer than 20 minutes to avoid GST.
Here's a photo of one of the veiltails back about 6 weeks ago. I kept them in a 55 gallon bare bottom tank until they started to pair off, which they did starting about a week ago.