Ibrahim
Aquarium Advice Addict
They can be territorial toward one another and may fight. A 6 gallon certainly doesn't afford them much room for territories. The OP has stated more than once in this thread that he doesn't want to have to worry about this tank. Why not take the conservative approach? You don't have to cram fish into a tiny tank just because it's theoretically possible. Just sayin.
Well maybe that's him but others who may read this thread may take it that it isn't possible while still keeping them happy.