I have seen tanks with Male and Female flowerhorns living together. Each fish is different. It is good that you have a glass in place to separate and monitor them. Does the Male get rambunctious when he spots the female or is it calm? I would mostly worry about the male cause sometimes not even a female can be around them. Maybe oneday remove the glass and see how they interact with each other. If all goes well keep an eye out for any attacks so you can put the glass back in. Each situation is different especially with Male flowerhorns. Since they are small you are at an advantage to get an early start with them getting used to each other. What is the tank size by the way, as this can affect your chances. Also you can add something for the female to hide in when she feels threatened. Hope this helps.