Difference between tank and tap water - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 04-27-2009, 12:04 AM Thread Starter
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Difference between tank and tap water

My tap water has a KH of 5 or 6 and a Gh of 5 or 6. My tank, which was filled with my tap water only, has a kh of 2 and a Gh of 3. It is about 3 weeks old, I've done a two water changes (10-15%), but the last one (about 8 days ago) killed off almost all my starter fish. The tank is planted with vals, anachris, water sprite, hydro, java moss, anubias, and java ferns. My pH is pretty low (6.3ish). It is a 50 gal long, with an aquaclear 70, flourite and gravel.

I'm curious what has dropped the hardnesses in the tank and whether large water changes with the much harder water would stress fish or plants.
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post #2 of 5 (permalink) Old 04-27-2009, 12:14 AM
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I don't have a clue where your KH went but the plant load can reduce GH. Crypts melt with hardness swings but what you've listed should be good with it. Test your tap water after its sat in an open jar for 24hrs. just for giggles.
KH changes change pH which bother fish if its too large.


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post #3 of 5 (permalink) Old 04-27-2009, 01:30 AM
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Vals consume KH, because the use carbonates for a source of carbon. Anubias also use carbonates. It is hard to believe that those plants could drop the KH that much is so short a time, but I don't recall seeing any data on just how fast they do drop the KH. If your fish died after a water change, the more likely reason is chlorine or ammonia in the tap water.

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post #4 of 5 (permalink) Old 04-30-2009, 01:29 PM
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Wkndracer,

Might be a fine point but:

Change in kH changes pH

Changes in kH changes TDS

Changes in TDS bothers fish

I've never found any evidence that changes in pH bother fish.
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post #5 of 5 (permalink) Old 04-30-2009, 02:07 PM
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Quote:
Originally Posted by Canuck View Post
Wkndracer,

Might be a fine point but:

Change in kH changes pH

Changes in kH changes TDS

Changes in TDS bothers fish

I've never found any evidence that changes in pH bother fish.
The fine point from my perspective is that unlike saltwater keepers most freshwater tankers don't have conductivity meters. The KH /pH relationship without the CO2 driven change is what most use for referance. I've ended up in 'warmer' exchanges several times regarding fish and they're ability to adapt to differant water parameters, the use of R O and so on. My personel experieces keeping the species I've choosen is what I base my statements on, what worked and what caused deaths.
Reading most posted queries regarding issues many don't even test GH/KH but do test pH. Lower pH usually means lower TDS but you reply stating that the response is "The what?"


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