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Water conditions (PH, GH, And KH, are important for GBR to start breeding.
They should be conditioned with live, frozen, and even some FD foods to help egg production.
Coralbandit has a great thread on breeding, and rearing fry. He has certainly done his homework, and has had good success with them. I used basically the same theory as he did, and have had some success with them. I haven't had them in years, so I hope I can remember the tricks. Getting the fry to survive and then to early adulthood is the tricky part.