I know I am no real expert and most of my L144, Lemons were bought originally to clean my discus tanks so had to live at 28 -30 degrees.
I decided to give them a go as they are all now mature so put them in a 180 litre tank, I have 2 males and 3 females. I must say once they start they don't stop but try lowering the water temp ever more to 25 degrees and I always poor cold water out of the tap straight in. My biggest female spawns every 4 weeks now with the big male. First spawn about 20, last 50+ last just coming out of cave so not sure. The others I removed and then they spawned but he left the cave so better luck next time.
Good luck with them.