Adjusting flow on a Fluval 403 Canister Filter?

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Stickleback

Aquarium Advice Regular
Joined
Jul 31, 2010
Messages
93
Location
N. Ireland
I am thinking that this filter running full pelt is a little strong for my Tetras (or minnows, see herefor debate lol ), and I am thinking about turning it down a bit.
Now... Crepe advised me to adjust the intake, as opposed to the output...good advice, but a few questions first ;)


Can any harm come to the filter by closing the intake valve halfway or so?

Will the filter still cope with the same bio-load?

Will it do the bacteria any harm to vary the flow, ie: faster in the daytime, slower at night or something like that?
 
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