The Wonders of the Water Change.

Even spikey wotsits and balls have a surface or multiple surfaces....

Afterall we live on a ball called the earth and it has a surface ;)
 
Or even 'surface area'
 
You would definitely not want to accidently stand on one of those.....they look lethal....they remind me of a kids toy from years ago, Sticklebricks
Oh man the stickle bricks! 😖 Still not as bad as stepping on lego
 
I think of surfaces as the tank walls.
Then you're doing yourself and your beneficial bacteria a disservice...
The BB adheres to and grows on surfaces and this is where it's to be found. The more surfaces you have, the more places for your BB to grow.
Those bits from your filter have been designed to pack as much surface area into the space provided as possible.
Even filter media, as seen under a microscope, is a mass of surface.

All of which takes me back to my original point that the water can be discarded, because whilst it does hold some bacteria, the majority is on the surfaces.

Edit: For literacy.
 
Can...opened.....worms....everywhere
:D :D :D

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