Looks like they are planning to spawn on them cables. They may get a little aggressive with the other fish. I have a lovely pair and similar in colours. They got quite aggressive but have calmed down alot now. If I put them in a tank on their own, they will spawn and the eggs hatch to wrigglers. Thats as far as I got with them before they vanished. Not quite ready for bbs I was told but I needed the tank for something else anyway.
I will try them again oneday. Nice angels.