) fish only occasionally doing flashes
) no white spots on fish
no visible signs
but it’s there and weakening the fish so that they die of OTHER opportunistic diseases.
I've had some unexplained deaths.
Anyways, Ich or other parasites can cause bacterial infections in the gills, and the fish can die off without any warning signs.
Other things can cause unexplained deaths also. Like toxic metals or rocks leaching, Old Tank Syndrom, osmotic shock from large water changes, aggression from tankmates, and probably a few more things I could think of. IMO, most deaths can atleast hypothetically be explained.
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