So I moved my betta fish and 1 ghost shrimp into a 10 gallon tank. The betta is doing awesome and appears to really enjoy all the room to swim and explore. I thought my ghost shrimp enjoyed it too but the next day he/she was dead. I thought maybe it was an old shrimp so I went and picked up 2 more ghost shrimp and next day 1 was dead. What am I doing wrong? I do not think the betta is to blame.