As for a short period of time, untill you get the tank ready, I think there will be no danger to any of the fish, – but of course obviously one of them will attempt this spawning which seems to be problematic with two. But I have never experienced ‘serious’ damage with paroes like other labyrinths. Provide maybe some extra plants or something.
I just had the experience with having four juveniles together and wondering why they didn’t seem to be doing very well, – a bit pale, scatterer, one not coming to eat and so… so I seperated them in two pairs, and voila 🙂 .. they all coloured up, and one pair spawned the next day. So I do think you are right that seperation is the next step and will give more peace and harmony.
Its interesting though, – that I have 3 P. nagyi in a small tank – 12 litter – one female and her two sons, and because I dont know which ‘son’ she preferres I kept them together, – and theres now about 5-6 off spring in the tank also. So sometimes its not such a problem. But i also have a tank almost totally filled up with java moss growth 🙂