I bought about 16 red cherry shrimps about 3-4 weeks ago and usually I can only see about maybe 6-8 at most but lately i've seen none! This got me really worried and so today while doing my water change I took everything out triple check them to make sure there were nothing hiding in it but found nothing.I checked the filter and found one, but it was dead. I also found three hiding and separated them temporarily. I also found the two baby shrimps (not counted in the 16) which I thought for sure would of died since they were small and would get sucked into the filter. They live in a 3.5 gallon tank with filter and heater and with Mr.Betta and some plants (Marimo, xmas moss, and some wavy grass looking plant). Mr.Betta was curious about them at first but left them alone after a while. So Im sure its not him. I have found a couple dead since I first bought them and did two water tests in 3-4 week time span and there was nothing abnormal. I didnt find any more bodies to prove that they had died nor have I found any pieces of them suggesting that Mr.Betta attacked them. it would be nice if someone told me what is going on!!