Yep, my cherries always seemed to disappear if I had fish in there. I'm pretty sure I also had some loss to stress and fish eating the baby shrimp. But, once I had nothing but shrimp and snails, it was like an explosion! I suddenly had shrimp on every piece of decor, in every plant, and swimming about the tank. Amazing. Although, the last time I had fish in there it was 10 juvie diamond tetras and 5 juvie kribs. Since I took them out, I have not had as many cherries as before. It has now been about 2.5 months since then and I probably only have about 50% of the previous population. I'm hoping that planting the tank a little more will help encourage breeding.