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both my pond/pool and the inside tanks use well water
and I do 150% changes often by running a pump out
after draining 75% I just add more water as the pump out removes more
chlorine and chloramine will kill fish and is in city water in many areas
PRIME or other water treatments for fish will remove chlorine but not chloramine
chloramine is very very deadly to fish
use well water if you can
if no well let the water age in a bucket
a few days before it is put in the tank
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