I got my betta and 3 ghost shrimp home Sunday afternoon. I have been checking on them each morning. Yesterday morn I could only count 2. Shrimp #1 was on the floor in front of the tank, all dead, did he jump? There are 2 small openings on the lid, a handle and above the filter... This morning #2 is dead in the bottom of the tank, and #3 is missing altogether... What am I doing wrong for my shrimpys?