Dying Koi: Can You Help?
The first thing I would do if you dont already have one is to go and buy a
good water testing kit. If I ever loose a fish the water specs is the first
thing I check. I dont think the CO2 killed the fish (through O2
depravation)....unless the fish were at the surface gasping before they
died. But I would say that the buoyancy problem you mentioned could
defiantly be a sign bacterial infection.
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