Interesting concept because their spawning habits are temperature driven. For example, when I had a breeding pair of oscars and wanted to breed them the system was quite simple. I would do about a 60% water change and when I refilled I would bring the temp down about 5 degrees. With the influx of fresh cooler water and a slowly rising temp from 72 back up to 76-78 it worked every time. I have seen this work with a variety of egg laying chiclids including jewels, dempseys, and green terrors. If the temps were to go below 55 degrees then gradually spike back up at the WWD, I would see no reason why they would not spawn. Maybe someone else has some more scientific info, but it would seem possible to me.