Dear Galactic Blue,
You'll have to enlighten me about what kind of filter a Fluval 404 is.
I try not to stir things up when digging around in the tank. I turn off the filter, etc.
Last weekend I did some major thinning out of rooted plants in the 45 gal and made a real mess. But the tank cleared up, and my canister filter is still running. I'll probably clean it out this weeken to make sure it didn't get clogged.
I think that you just have to get used to working with soil and feel comfortable with it. I (and many home gardeners) like working with soil; it's so real.
Diana Walstad