"bo0ger1" .@. wrote in message m...
Water change

Old tank syndrome symptoms can be an effect of insufficient water changes.

Which can be read about he
http://www.advancedaquarist.com/2006/10/aafeature

Don't believe everything you read.

Did you read this part:
"Water changes of approximately 10 to 25% monthly help to limit the
long-term change in the ionic composition of seawater in a closed system
aquarium."

Do you know what limit means? It doesn't mean prevent. That means you can
do water changes and still have the same changes in ionic composition.

So which tank will experience bigger difference in the ionic composition:
- the one you replenish 25% of water composition every month ?
- the one you replenish 10% of water composition every month ?
- the one you do not replenish used up ions at all ?