So...did I miss something here...the original plan was set up tank for girlfriend's birthday right? I am in the right thread :-? OH MY GOSH...I am...MTS has struck already WOW!
:lol: :lol: :lol:
Your filter will contain media that will be home to the "good" bacteria that you want for your tank. To give you an example, my filter has a "bio" filter that NEVER gets changed, and if it is really yucky, only gets swished around and rinsed in water that has been removed from the tank, when I'm doing the monthly cleaning, I save the last bucket of water to house my filter while I'm cleaning and the do the "swishy" around routine with it.
Now, I'm not familiar with all the different filter media that is out there, but many here are. But, the wise ones can correct me if I'm wrong, but all filters have some type of media that is home to the "good" bacteria.
The movement of the water through the filter keeps the bacteria alive (again oh wise ones correct if I'm stating this in the wrong way); therefore, turn off filter, "good" bacteria dies. Now it does take some time, but turning your filter off, other than to clean, on a regular basis is a no no.
Hope that helps :-?