If your interested in spawning blue rams, live foods are really a necessity. Rams like the water in the range of 82-84, PH 6.0-7.0, KH 1-2. They won't do anything in water that's 72. If your afraid of rainwater, add a little blackwater extract to your cooler tap water and see what happens. To tell you the truth, I was never able to raise any fry past the two week mark either. That's why I switched to Apistogramma Cacutouides. I can't stop them from breeding . I'm raising five diiferent batches now, the oldest are over five months old.
82-84 degree water, cool water change and live food = spawn.