In the last week I have lost 11 cherry shrimp and 3 of my ammano. My water reads as 0 ammonia 0nitrite and 10 nitrate . Ph 7.2 it's a 20g long with 5 endlers. I haven't done anything different to the tank so why would this happen ? I have noticed some teeny tiny white bug things , could they be the cause ? Please can someone help , I am absolutely gutted .