I wish I could help you rickyrooz1, I think the Doctor has gone over this. They'll flash with other males in the tank (at least from his pics!) and certainly there should be times with a female or group of females that he would flash - to me, the latter would seem less stressful. I have a male hybrid (me thinks) with females and he never flashes. Maybe he's just too young.
Given the number of hybrids I've seen on this thread, I think any flasher (male or female) would do the trick. Although with yours, if you went with a male, a flavianalis would make for a nice contrast - just my aesthetic call
My flashers look totally boring...
Meredith