Its the fourth attempt Im failing. Nobody could help me. I raise fish artificially as parents eat their fry. I place breeding slate to a rearing tank using same water in the breeding tank, with Methalyne blue and aeration. Water is changed 50% everyday (prime conditioned aged water). And hobbysts in some of the other fish forums said it might be due to ammonia spike. How come there will be ammonia spike when I change 50% twice a day. Ph is 7.5 and TDS is 140 to 150 PPM. Earlier i never faced this issue.