How I removed hard water stains from a secondhand aquarium

I am having trouble understanding levels of water hardness in my aquarium. The readings I have taken show a KH of 50mg/l and a GHof 120mg/l but my colour coded Co2 monitor shows the level is to low. As all the books I read and the test kits I have used seem to use different units ie: ppm; mg/l; german degrees and french etc. I am lost can anyone advise me.

Scrape away large areas of hard-water stains with your aquarium razor scraper. You do not need to remove your fish while scraping the tank.

Another big plus to hard water is that someaquarium plants can use the carbonate salts as a fertiliser. Plantsadapted to soft, acidic waters like many and some rely on dissolved carbon dioxide as carbon sourcefor photosynthesis. They effectively take the carbon dioxide and turnit into sugars and all the other organic chemicals they need for energyand growth. This is essentially the same thing as land plants do whenthey absorb carbon dioxide from the atmosphere. However, some aquaticplants can absorb the carbonate salts and strip away the carbon fromthem, and use that as their carbon supply.

Hard Water Stains And Top Scum? | My Aquarium Club

This test kit includes everything you need to measure the general and carbonate hardness of your aquarium water. How I removed hard water stains from a secondhand aquarium.
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Hard And Soft Water? | My Aquarium Club

The soft water aquarium presents both opportunities andhazards to the fishkeeper. On the plus side, there's no doubt thatsome of the real jewels of the freshwater side of the hobby --including , Harlequin Rasboras, Cardinal Tetras andAfrican Killifish -- never look better than when kept in soft, acidicwater stained the colour of tea. Under such conditions these fish trulyrival mbuna and coral reef fish in their beauty, whereas when kept inhard water their colours are often lacklustre and muted.

How to Soften Hard Water in Aquariums | eHow


One of the first things new aquarists learn about is the differencebetween soft water and hard water. Put simply, hard water contains moredissolved minerals than soft water. This is important because most fishare adapted to either soft water conditions or hard water conditions,and relatively few species do well in both. So newcomers to the hobbyare usually instructed to test their tap water to determine whetherit's hard or soft.Soft water is water that contains low levels of dissolvedminerals. Aquarists consider what that has less than 5Ë°general hardness to be "soft water" and between5-10Ë° general hardness "moderately soft water". Itis also quite common for soft water to be described in terms of calciumcarbonate concentration, in which case soft water has less than 50 mg/lcalcium carbonate and moderately soft water between 50 and 100 mg/lcalcium carbonate.