I have just set up a new tank it's been running for 5 days now, the filter I have on it was taken from one of my other tanks which has been running for about 6 months so the media in the filter is mature. I also added cycle to the new water in the new tank. I just did a water test using the API water test kit the KH (Carbonate hardness) reading was 240 is this water safe for fish yet all other parameters were fine.
