Is using the water from a water softening system safe for fish in a freshwater aquarium? We have hard water with a bad smell in the summer and considering a water softner system but want to be sure I can use that water in my 55gal aquarium.
Softening water does not decrease the pH, it slightly to moderately increases the TDS (total dissolved solids) and adds sodium to the water by 7.85 mg/l per grain per gallon of compensated hardness.
IMO some/few? fresh water fish may be fine and others/most if I guessed may not. And it probably depends on how hard the water was before softening.
some fish like a little salinity, others not and sometimes changing it can put fish into a breeding state of mind.
This is awkward, but...
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