Last Sunday my wife did a 50% water change and used rain water I was storing in a nearby empty tank for the refill. The parent's tank is 81.3F today, but the rainwater tank is 72F so there would have been a slight temp drop as well when she added the rainwater.
I assume they spawned that Sunday night as the fry appear newly hatched today (6 days after the water change).
Tank is a 20 gallon long filtered by a Penguin 660 powerhead (170 gph) with an attached sponge filter and a Penguin biowheel 180 HOB (180 gph) also with a sponge filter attached. Tank has a slate bottom with no substrate. Decor is two spawning caves under a large slate tile and a large piece of driftwood.
I will test pH, GH, etc tonight.
I guess that technically my wife spawned these
![Smile :-)](./images/smilies/icon/smile.gif)
-Shane