Start doing weekly water changes of 10-20%, but don't add any more rock salt.

Eventually it will be flushed from the system by the water changes.

When water changes from gas to droplets, this makes heat.

Some also recommend a water change of at least 50 percent.

Over the next six days, 18 fish of various types died despite water changes.

Do not carry on with large water changes, however, as these only perpetuate the problem.

It died suddenly in the morning after a careful partial water change.

This easily cured by a water change, which should be regular.

Take care when doing water changes as they do not like great volumes of freshwater.

A quick partial water change will often effect an improvement in a matter of hours.