Mike.............suggestion! Whatever size tank youmhave them in double it and let the males begin to dominate each other and all of that Apisto stuff. At 50+ days someone should have shown a male trait. Look for the extentions on the dorsal.........the first 3-4-5 rays....or see if the caudal extentions mare beginning to form......that is to make the caudal look squarish. If not within the next 2-3 weeks...........welcome to the wacky world of Apisto genetics. Mike