Should I use RO or mineral water for my fish tank due to heavy metals?

Question

Can use mineral water for aquarium. My tap water has lot of heavy metals. I have 10 galloon tank with 4 guppy 4 danio 1 silver dollar. 1silver dollar and 1 pleco died bcoz of 2 gold fish earlier in my tank. So i decided to use RO water. Can i use. Pet's info: Fish | Unknown - Fish | 0.01 lbs

Angel Alvarado, LVT · Accepted Answer

RO water is devoid of minerals and trace elements that help stabilize pH and other parameters. If you can add these after filtration then use your RO water. Otherwise, RO is commonly used to "top off" fish tanks that lose water via evaporation.

Should I use RO or mineral water for my fish tank due to heavy metals?

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