Hi Stefanie,
of course you are right!
But I find other ways to save energy and I get my energy from Energiewerke Schönau, who only sell energy from nenewably sources (means they spend the money they earn in building renewable sources of energy),and it costs therefore a little bit more.
I am just afraid that my fish would suffer if I don´t give them a filtration … 😉
And I thought I would´nt be able to have healthy paros if I would give them only the 20 degrees C we have in our flat.
And I´m really interested if there is anyone who has thought about the problem that the HMF Filter, which also save energy, are so loud ..
In the www you find only people who want silence for themselfes – they seem to have no thoughts about the feeling of the fishes with that…
Perhaps someone has made a noise and vibration measuring in the water and thought about how fishes sensor it????