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Too many fish for a 125G, what are the species and genders?

Did the pipe break before the deaths? Water providers often flush the system with extra chlorine when the system is opened.

Are all the fish eating every time you feed? Anyone lurking beneath the surface or behind heaters and intakes?

Are the feces thick and food colored or thready and white or clear?
 

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Usually aggression problems begin after a year...so for you maybe it is 1.75 years.

Columnaris is large fuzzy white patches on the sides of the fish. You did not mention anything like that.

The ones that are lurking are being harassed. Once one of these dies, you can end up with an illness like bloat that takes fish periodically over time.

Are there any lurking/not eating now? Net those and isolate in a hospital tank. Se if you can observe the thready white feces.

Another thing to try is test for chlorine. When they fix pipes they treat with chlorine then flush. Then test for a safe level for humans.

Problem is the safe level for humans is not the safe level for fish.

In a house the danger would be gone in a week or so.

In a building maybe the larger water tanks for hot water or whatever continue to give you chlorine and chloramines too high for your dechlorinator to handle.

Once you are past the current crisis I would make some stocking changes. Too many zebras to start. For 125G I would lose about 3 species and make sure you have 4 females (or more for maingano and labeotropheus) for every male.
 
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