I really don't know why my Colombians spawned. I have really hard water so they shouldn't have been "in the mood," so to speak.
Some say to feed them well with live/frozen food for a couple of weeks, then do a large water change with cooler water (maybe a 5-10° temp drop from current tank conditions). This simulates the rainy season.
But mostly, have a lot of vegitation for any resulting eggs/fry to mature in...unless you care to transfer eggs to a nursury tank. I had a volleyball-sized clump of Pellia in my tank where the fry hung out—safe from predation.