personally , i have not kept maculata as they are extreamly hard to obtain in the uk , they are however another sub-tropical to warm temprate species comming from southern china , so again cooler tank is prefered ,but this fish has established its-self in tropical climates where it has been introduced so probably tolerates a very wide temp range , it is said that maculata is quite aggresive and on par with asiatica , personally i would only keep one , because if you kept three unless all the same sex (which i dont belive there is any way of telling on maculata) there is a real chance even in warmer water that two would pair off and cause mayhem in your tank . or split them up if a pair formed , it is also said that they do not like other snakeheads but i think phulltank housed his with other channa (iam sure he will correct me if iam wrong ) i would wait for phull to chip in here or give him a pm ,as there is only him and i think pascal that have kept theese on the board , and only phull that has mixed it with others
cheers col
cheers col