Hi,Prometheus.....
I just keep subtropical species......so yes,most of my snakeheads breed within 22-24°C......no heaters installed,very energy saving!
Just some of the tropical ones (orientalis,Platinum and panaw were kept at higher temperatures!)
i use normal tab water,no chemical stuff inside.....german water is one of the best in the world,drinkable and clean.....
Hardness around 8°, ph level around 6-7.....
So no magic....
I keep all of my snakeheads as a couple.....normally no tanakmates.
If you want to breed,you have to keep them seperatly,otherwise tankmates might get killed....
my tanks all look natural,no plastic plants or other stuff that does not belong to aquariums....just real plants,wood,& stones....
the adults were fed with frozen or live food every 2-3 day.....depends on temperatures...
In wintertime the temperatures drop down to 16-17°C ,because I keep my fish in the basement...
So thats all.....
Regards!
Pascal