Sudden Fish Death Help


New member
Needing help/advice

I have a 125g tank set up on a Rena XP3. I have had it for 12+ years. It has been on auto pilot for 10 years. Just water changes every other month. I had many babies and every thing was going well. It even made a move from one house to the next with no issues. All of a sudden Saturday we stated losing fish. Filter as running and temp was still good at 72. Thought maybe it was a fluke. By Sunday afternoon I had two fish left. These were 10+ year old yellow lab cichlids in good health. I went to run a water test and my test kit was so old I had to order another one. I did a 50% water change, did not clean the filter. Thought it would be too much shock. Today I got my new test kit in nad not ONE level was off. Even a little out of the norm. Nothing. Today I lost the last two fish that were in there. Now I have an empty 125g tank. My kids are super devastated as am I. Any help would be appreciated.


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OB Guy

Did you do anything to to the tank or make any changes recently? Have you added any new fish recently? What were the readings on ammonia nitrates and nitrites?

OB Guy

I see your water temp is 72 that's real low for Cichlids it should be at least 78. I keep all my Cichlid tanks at 82. Did you quarantine the new fish? It's possible they may have been sick and caused the problem.