55 Gallon Discus Tank! - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 13 Old 11-14-2006, 01:17 PM
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Originally Posted by bettababy
if the fish are stocked properly to the size of the tank, the large water changes weekely wouldn't be needed.
True, but weekly water changes will keep your tank more stable. In the wild, these fish are contained in HUGE amounts of water. What we are doing is the equivalent of keeping a dove in a cage. In the wild, a dove doesn't need it's living space cleaned since it has an nearly infinite amount of area. Same with fish.

Originally Posted by bettababy
Changing too much water at once can be dangerous.
Only if we are discussing a tank that gets INFREQUENT large water changes. It is true that everything that you have mentioned can (and will) happen to a neglected tank that gets a huge water change, but not for a tank that gets a weekly giant water change.

I agree with absolutely everything else that you have said

Fish have taken over my house. I threw away my couch to make room for another 125 gallon.
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post #12 of 13 Old 11-14-2006, 01:44 PM
BB and Al

It is intuitively obvious that "yall" have way, way more experience than me but I attempt to attain a uniform steady state condition of the tank water parameters via filtration.

I do bidaily 10% WC's (with RO) via the sump of my wet/dry filtration system.

With the quantity of biological filtration in the 1st and 2nd chamber of my sump I could probably transition over a 28 day period to 10% weekly or biweekly WC's without adversely affecting the water parameters.

I perform such small WC's because I am concerned that significant anomolies in the supply rate of nutrients for the bateria in the biological media will adversely affect the biological filtration process.

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post #13 of 13 Old 11-14-2006, 02:01 PM
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I was not suggesting skipping weekly water changes, just commenting on the amount at a time. If it's done regularly from the start, the changes don't need to be large to keep the tank stable, so long as the changes are regular.
As for the dangers of large changes, even if water quality is good, there can still be changes in params in tank vs tap, especially temp.

Dawn Moneyhan
Aquatics Specialist/Nutritionist
Juneau, WI
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