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Planning to have my Betta in a 17 gal semi heavily planted tank with established filtration. Based on the waste produced from one fish would I need to water change even once a month or at all?
 

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Weekly 25% with vacuum. Water changes are as much to replenish minerals and trace elements fish require for good health as they are to remove detritus. If replacing evaporated water use distilled or the TDS/GH will increase.
 

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Alone, distilled is not good because it contains nothing. That's exactly why it is best when doing a top-off.

When water evaporates the mineral, salts, etc., do not evaporate along with the water. Instead, they concentrate. Replacing with distilled doesn't add to the concentration.
 
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