i have 2 flowerhorn a male and a female. my male about 3" and my female is about 2.5" im planning on the mate them when they get bigger. right now i have them in separate tanks. i have an empty 30 gallon tank. i was planning on putting them in there but im not sure if they are going to kill each other. they have never seen each other before. this is a new tank and none of them have been in there.