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Anonymous
Fish expert here,
You tank's biological filtration is dead, and you don't have any scavenging fish (besides one algrae eater) So uneaten food is just laying on the bottom and essentially molding. Seen it a million times, takes forever to figure out the first time then you never forget it.
In mature, healthy tanks uneaten food and dead things that the fish do not immediatly eat are quickly consumed by bacteria, microbes, and other small organisms. In my tanks I never even know if a fish died until I count them all, bodies are digested overnight like a rotten tomato in a rainforest.
Usually happens when people feed to much in new tanks, or "clean" their tanks, and by clean I mena take out all the gravel and rinse and maybe even use some bleach, and at the same time change all the filters cause they are dirty etc...
Fish are probably dying from ammonia, probably from "cleaning" the tank or feeding to much or dumping a lot of fish in after just setting the tank up.
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