If you had a really big tank in which you can put a massive school of neons, and still have lots of swimming room, they'd have a much harder time getting cornered, and their masses can confuse the angels. Their population would likely start to dwindle over time though, as they're bound to get caught sometimes, so you may need to beef up the numbers once in a while. I wouldn't do it any which way if you're concerned that any at all might get eaten.