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Males could be ready at 1.5" females at 1", size is a relative thing, if the fish were not cared for properly in the begining they may be more mature than their size reveals. Unless you know their age and/or history.
Females will fool you...often yellowing up and "defending turf" in my 55 gallon growout tanks. I shipped some (2 pair) week before last to a customer in New Mexico, overnight on Monday, they arrived on Tuesday. The gorgeous little females were about 3/4". The customer e-mailed on Friday evening after watching one pair spawn, and again on Sunday after watching the other pair. I told him I was looking for lightweight spawning caves to put in the shipping bags.