I had a breeding pair of Jags (I assume Big Daddy is a managuense) and raising young with the parents in a 150 gal tank for a fairly long time.
To me a successful spawn is ending up with 20 or 25 really healthy, robust young, even if it starts with a thousand eggs and fry.
The largest problem is when they are ready to spawn again, then both parents may see the fry as a threat to the newest spawn. So it is usually better to first remove the male to separate tank, preventing a new spawn, or his hormones getting the best of him, and eating fry. But....
I had more trouble with fry eating each other when all together.
So after a while I just ended up getting a bunch of grow out tanks, and separating fry by size, so all the females wouldn't be eaten by the (usually ) faster growing males
I've also had incidences where fry (if I ended up with too many), start to eat the parents, and the parents barely protested.
I had to remove a male haitiensus to save his life,when fry ate a gaping hole in his side.