I would transfer the 1 Discus over to your Big Tank, just keep an eye on the Ammonia, and DONT overfeed him :roll:
I would Transfer the External Filter over to the Main Tank aswell
Leave the Breeding Pair in the 60L Tank along with a Heater, if you do Water Changes everyday you wont need a Filter, if your wanting to use one just go with a Small Sponge Filter
Discus Temps should be sitting round 29-30
Mine have decided to Lay again tonight, the layed last night aswell, then decided to eat their Eggs, so here's hoping this time they might get the idea of what they are meant to be doing with their Eggs :roll:
Do you have a Water Test Kit??