All my fish like to spawn after a good cold water change. I look at it like this, Its like wet season, all lakes and rivers fill with good fresh cold water, all the wild life love it including the fish.
Totally agree with this.
Water a few degrees cooler than the tank water is what I usually do.
Humans and fish grow quite differently. Breeding or not, dovii will get too big for just about any home aquarium eventually.
If your goal is to successfully spawn them, do it when they're small and they don't need a 12' tank...
Matt
There was a 20" + male with his male along with his mate offered for free locally but no one was able to take them due to not having at least a 300g tank to probably a pair that big. I believe the owner is a member here as well.