Neon tetras naturally occur in very soft water with a general hardness (GH
) below 100ppm and usually below 50ppm. If your GH
is 269ppm then it is way too high for any tetras and is suitable for livebearers (mollies, guppies, swordtails), rainbowfish and goldfish, or Lake Victorian cichlids. If you want to keep tetras, either use a reverse osmosis (r/o) unit or make a solar still.
Get a large plastic storage container and put it outside in the sun.
Pour a bucket of water into the storage container.
Put a clean bucket in the middle of the storage container. Have a rock in the bucket to stop it floating around.
Put the lid on the storage container.
Put a rock or small weight on the lid in the middle, so the lid sags above the bucket.
As the sun heats up the container, water will evaporate and condense on the underside of the lid. The water will run towards the centre and drip into the bucket. When the bucket is full of water, you put it into a holding container and put the bucket back in the storage container with another bucket of tap water.
You get pure water with a pH of 7.0, 0 GH
, 0KH and no wasted water, no power used and it's cheap to set up.
Use part r/o or distilled water with part tap water to get a more desirable GH