I woke up today and found that my cleaner and fire shrimp died. I was very mad. I don't know why, nitrate, nitrite and amonia are all ok. I just did a water change two days ago, about 10 gallons. my fish tank is 46gals. so 1/4 I guess. Oh, my timer when off and all the powerhead as well as the filter went dead for the night. I just got the timer, wrong programing. Anyways, do you guys know what cause my cleaner and fire shrimp to die?