Rich, I have 4 large adults in my display.  I started with 5 - but one was killed off.  I have not seem them ever holding any eggs.  Is it possible that I have 4 males, or 4 females (yes obviously!), but what is the best way to test them?
	
	Should I capture all 4 and then introduce 2 at a time to a smaller tank - say a 20 gallon?
	
	I would like to then keep a pair, or a known female and rotating males in my breeding tanks, any help would be great.  Also, anyone seen somewhat mature fish recently - even a 4-6 month would be sufficient.  Otherwise, I would love to get a few babies to raise.
	
	Thanks!