here is what THE CICHLID ROOM CHAMPANION MARC WEISS HAD TO SAY;AVOID BROADSTOCK RAISED IN HARD WATER ALKALINE WATER. THIS MY LEAD TO CALCIUM DEPOSITS IN THE SPERM DUCTS,AS A MALE GROWS UP,THESE CAN BE POOR BREEDERS OR EVEN FUNCTIONALLY STERILE. DISCUS RAISED AT A PH ABOVE NEUTRLPH7 LACK GOOD DISEASE RESISTTSANCE ,AND ARE HARDER TO ACCLIMATIZE TO NEW EVIRONMENTS,DISCUS CAN BE AND HAVE BEEN BRED EVEN IN PARTIAL SEAWATER,BUT I PREFER TO STACK THE ODDS IN OUR FAVOR! IT MAY BEMA YEAR OF SUPERLATIVE CARE DOWN THE DRAIN, SHOULD WE ADD RISK FACTORS INTENTIONALLY EARLY ON.