Well day ten and I still have 7 fry left. Hope my hatch Sunday is better! I found out 2 out of 3 of my roti cultures died. The only one left was the one I had a heater in. I guess they got to cold. I added a heater to one other one and will get another for the last one. When I star doing water changes on my fry do I need to add broodstock tank water or new saltwater?