Old Water....??? - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 12-02-2005, 01:59 AM Thread Starter
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Old Water....???

While reading various Forums I have come across the concept of "Old Water" more than once. Basically, what was being referred to is water that is good by water parameters, but "Old" from lack of water changes.

I have a 55gal. freshwater aquarium combined with a 29gal. refugium. The refugium contains Val, Anacharis, Anubias, Frog bit, Duckweed, 4 different types of snails, red cherry shrimp, bamboo shrimp and freshwater clams with a sand substrate.

With only adding some food for the inhabitants of the refugium--my nitrates are staying at about 20 and my other water parameters are fine.

Given that water parameters remain fine--Can somebody explain to me what exactly "Old Water" is and what it's negative effect is...???


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post #2 of 8 (permalink) Old 12-02-2005, 03:18 AM
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Years ago fish keepers used to pride themselves on old water. This was water that had been in the tank for years. And it would take on a yellow tint. It was thought that this was better for the fish because it indicated a balanced tank. ]

Well to me it would be like bathing in your own piss.

Nitrates are only one thing we can measure. There are a ton of other harmful dissolved organic compounds in the water. Doing water changes helps remove these.
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post #3 of 8 (permalink) Old 12-02-2005, 03:34 AM
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post #4 of 8 (permalink) Old 12-02-2005, 04:09 AM Thread Starter
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Ok, I understand.....BUT do the plants remove the other dissolved organic compounds?

I don't have any issues with water changes--I'm just really curious about what's going on here......


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Last edited by Naja002; 12-02-2005 at 07:09 AM.
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post #5 of 8 (permalink) Old 12-02-2005, 12:15 PM
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They might remove small amounts of some of them. But primarily they are nitrate and phosphate sinks.
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post #6 of 8 (permalink) Old 12-02-2005, 09:54 PM Thread Starter
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Cool. Many Thanx, Rex! I kept wondering: "What IS Old Water...???"


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post #7 of 8 (permalink) Old 12-04-2005, 07:42 AM Thread Starter
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Ok, I have another quick question on this:

Do the Filter Feeders (Bamboo shrimp and Freshwater clams) filter any of these "other" compounds out...???


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post #8 of 8 (permalink) Old 12-04-2005, 12:14 PM
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Nope. Filtering out those compounds would be like trying to filter sugar out of water once it's dissolved.
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