if u just keep adding RO water to tank to cover evaporation u are just making ur water hard over time. trace elements keep goig down and so will ur oxygen levels.
Oxygen levels are unrelated to water changes.
Making water hard implies you are adding magnesium or calcium, which are not present in pure fresh water, and if they were, probably would be a good thing.
Some trace elements may decline, but don't ignore those that are actually rising. Water changes help both situations, at least relative to what is present in the salt mix.
Oxygen levels are unrelated to water changes.
Making water hard implies you are adding magnesium or calcium, which are not present in pure fresh water, and if they were, probably would be a good thing.
Some trace elements may decline, but don't ignore those that are actually rising. Water changes help both situations, at least relative to what is present in the salt mix.
