Hi. I have read a lot about various issues with maintaining an aquarium. On the topic of substrate vacuuming, many say you should do it, but others say it is not necessary (in a mature tank with no overfeeding). One concern is disrupting the beneficial bacteria. The advice is to do small sections each time. My substrate consists of pebbles. I am having difficulty with this issue because I have many resin caves, plastic plants..etc all over my tank, which I spent many many hours shifting around to get them in the ideal positions for controlling current and for aesthetics of the tank. So it is very annoying trying to vacuum without disrupting the whole decor and I'm worried about disrupting the beneficial bacteria. A much easier way (which I tried) is to use a spare pump to spray a jet of water on the substrate and blow up the detritus/gunk into the water column and then proceed with a partial water change (which will remove part of the suspended detritus/gunk, then just let my two canister filters suck up the remaining debris out of the water column (mechanically filter). Then after everything clears up, I could just clean my mechanical filters (my canisters). Of course while following the proper technique so as not to kill the bacteria in the mechanical filter. My question is the following: is there any problem with using this technique instead of vacuuming? (Blowing up the debris into the water column). Wouldn't this technique be less likely to disrupt the beneficial bacteria? I would appreciate any advice on this topic. Thank you.