I had three pair for a couple of years, try as I might, I was never able to raise any fry. Each time I would try and fail and cry. It's so sad to see all those perfectly made babies just dying but I couldn't "not try". I got mine when they were teenie, tiny otherwise I would have gotten all one sex.
Mine appeared to be very hardy horses, they survived power outages during the hurricanes, hair algae outbreaks, and assorted equipment failures. I lost them when we lost power in the winter for three days while we were out of town, the temps were below freezing and I came home to massive kill off. The only thing that really survived were a few mean old clowns.