Upon the surface, it could be a number of things. What do you treat your water with? Some dechlors only treat chlorine and not chloramines. Some dont remove heavy metals. Did you just remove water of did you do a gravel vac also? Did you rearrange or uproot anything? Was the new water temp the same or close to the old? What size tank and filtration? Any other inhabitants? How large are the loaches?
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Member of the AGA (Aquatic Gardner's Association)
Member of the IBC (International Betta Congress)
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