I'm going to be growing out 2 flowerhorns in a 75. It obviously won't be their permanent home and I will have another tank when the time comes. They're small now, Just over 2" and both male. I will be obviously using a divider but was wondering which route to take. I know how to make a sturdy divider out of some egg crate. Will that be ok? Is it ok if they're able to see each other or should I use something else?