Help about to give up!! - Page 3 - Tropical Fish Keeping - Aquarium fish care and resources
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post #21 of 21 Old 04-10-2012, 05:31 PM
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Originally Posted by Macrocosm View Post
It is ppm.

So if we do a water change in the next couple days on our 46 gallon tank. How many gallons should we change if we only use tap water?

For the record our tap water measured from the spout:
GH 180 ppm
KH 120 ppm
pH 7.0
If it were me with tap at 180ppm (= 10 dGH) I would probably dilute it about 1/3, so in the fish tank from scratch, 2/3 tap water conditioned plus 1/3 distilled. Test the GH and KH, but GH should be around 6-7 dGH.

If you have fish in the tank, go slow, less volume over more changes to get to this. Once you're there, weekly partial water changes of 40-50% of the tank can be done with water in about the same proportion. For a relatively small tank (46g) this will be easiest with a tub like one of those plastic garbage pails on wheels. You can mix the water and condition it, then add it to the tank. You'll soon work out the proportions.

The pH will likely lower in time on its own.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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