Posted: Mon Oct 17, 2005 7:30 pm
Yes, you remove a percentage/amount of the water. In larger tanks, when beneficial bacteria have colonized on the filter's biomedia, waste and more toxic substances are broken down into less harmful ones, which can be taken care for for a time with partial water changes. And having a lot of water in a big tank means that it doesn't have to be cleaned as often as a smaller one (this also assumes a good filter is being used). One has to be really religious about doing the partial water changes, though. This doesn't work with small tanks and certain filters. (And since Leo is being treated for shell rot, you really want to keep his water clean--doing a water change/cleaning at least weekly would be good.) I should have added above, that I also use a wet/dry vac to pick up debris when I do a partial.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-