So, in the past few days, I've noticed that I didn't have as many CRS's.. and since this incident where the shrimp were trying to escape, I had the water level topped off because they seemed to chill off. Well, tonight, I found a couple of dead CRS's in the filter housing. I'm supposed to have 15 of them, but I only count only about 10. It seems that quite a few have went against the current and died. I now know to keep the water level lower permanently, doh!!! Strange because water parameters were fine last time I checked.. I'll check again. The only thing that has changed is the big piece of driftwood that's put in there, and it's releasing some tannin.
Man, I have way more RCS's than CRS's now with all these RCS fry popping up. I was hoping for the opposite..