Sand and low pH

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Postby KittyKat » 2006-09-08 17:18

Just thought I should warn those who do not yet know that adding sand to an aquarium which already has a low pH can cause a pH crash... so if adding sand to a softwater tank, it is advisable that you do a water change almost immediately with harder water or add the sand before adding the fish so that the pH has time to settle :)
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Postby sharkdude » 2006-09-08 21:21

pfft my fish are uused to them....
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Postby KittyKat » 2006-09-09 08:16

Fish don't exactly get used to pH crashes lol they ain't good so you really do need to address the problem if it's there. I find that a few shells in the tank tend to help quite a bit because the extra acid reacts with them so that you're much less likely to have a rapid change in pH.
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Postby sharkdude » 2006-09-09 14:40

true, but I think I ph changes rather than crashes i fond it can be ph 7.5 one week and 6 the next the fish don't show any ilness etc, mind you could be a salt problem again.....
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Postby KittyKat » 2006-09-09 15:25

You should do a test on your tap pH before every water change to see if maybe that's changing?

When the pH changes from 6.0 to 7.5 the concentration of H<sup>+</sup> ion changes by over 50 times!

Salt problem?
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Postby -Rambler- » 2006-09-14 11:46

What kind of sand lowers pH?
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Postby KittyKat » 2006-09-14 11:51

Most "normal" sand (play sand, etc...) would because it it contains SiCO<sub>2</sub> which is acidic in nature.

Coral sand would not definately not!
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Postby sharkdude » 2006-09-14 16:34

nope all the waters soft kat

The salt often makes teh test go haywire but they fresh water kribs are the same....
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Postby -Rambler- » 2006-09-15 00:51

Yes, Right. Silica that is solubale would be acidic. I have never noticed it altering my water before, but my water isn't acidic after it aerates. Hmmmmm. I suppose the water has to be somewhat acidic to begin with (as you said soft waters) to dissolve the soluble silica :unsure: When I am moved in to my new home I'll have to experiment with this. Most sand besides volcanic and aragonite has silica in the form of quartz usually. Thanks Kat
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Postby KittyKat » 2006-09-15 08:51

I do not find sand to be a problem with hardwater tanks... it is also most common IME for new sand to cause problems ratehr then sand which has been in tanks for a few years and is only being moved tank to tank.
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Postby sharkdude » 2006-09-15 20:25

what if you sat it in a tank(without fish) for a couple of months
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Postby KittyKat » 2006-09-15 21:20

A filtered tank and you did water changes, then might work... never tried that tho!
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Postby sharkdude » 2006-09-16 10:48

some thing to do tehn :P
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