I had two females that had fry about a week apart. I figured I had about 40 total. As I watched my babies grow there didn’t seem to be as many and I thought maybe they just died. Tonight I broke down my filters and there was about 15 of my missing babies. They were small because they were surviving in about 1/4 inch at bottom of filter, but swimming like little troopers. I was shocked, so I will now forever check the filters.