hi nathan , they really are not suited to com , they are possably the most aggresive snakehead out there , i have tried theese fish with others and it has not worked , and they do really hate each other , they really need a hiding place for each fish with a fair distance between each hiding place , even in the wild where they are caught , there has never been two caught together allways only one , even the one that was caught carring eggs in its mouth (hence how we know they are mouth brooders) was caught on its own ,i know the price was a steel but that is for a good reason , the price for them now in cheap shops is around £20 , dan at tropical imports has just sold a load of them at £20 each iam sure this is also due to the fact that they are such a specialized fish that needs an extreamly large tank to themselves even though they are a dwarf species and a lot of people are put off by them , esp when the pulchra is at the same price but have allready been bred and is a much less aggresive fish ,
if it where me i would just keep the 12 in the new tank , set it up for sub-tropical with many hiding place and floating cover , put in large stream power head seio tunze ect ,for extra flow then in april next year turn it off , keep water changes to a minimum and who knows you could just be the first person to breed this species
good luck with them whatever you decide
cheers col