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Since you properly acclimate to both temp and chemistry of the new source water, use limited additives, other fish are fine.....you are most likely starting out with a very compromised fish and the small changes stress it sending it over the edge......not a lot you can do....except....try a drip acclimation and acclimate over 24h period.......sometimes with severely stressed fish any small sudden change can cause osmotic stress that usually will kill them in 1-3 days...no treatment once it happens...prevention only by drip acclimation......
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