This morning I awoke to my firefish goby swimming funny (kinda jerky). He was fine last night. I scooped him out and got him in to my quarantine tank. He died a few hours later. He had no visible spots on his body and until this morning seemed perfectly healthy. So I tested my water ammonia 0 nitrites 0 nitrates 2.5 PH 8.2 salinity 1.024. He was in my 30 gallon with a Clarkie Clown and a baby Dwarf Lion. So any ideas on what would make him go down hill so fast? The other fish are fine.