OK- this is likely 'intuitively obvious to even the most casual observer' (shades of school!
) - but I'm going to ask....
When you do (say, a 50%) water change:
(Assuming I've prepared treated water in gallon jugs that have also sat for 24 hrs:)
Do you take the fish out (placing in current aquarium water), then remove 50% of the water, then replace 50% water, then add back fishie(s)?
Or do you do it with them in the tank? (wouldn't that be disturbing?), or?
Do you ruffle up the gravel*, etc (to have the filter do some work) while you're changing the water (or do you need to buy a vacuum to do that)?- or do I leave it alone? (trying not to mess up bacterial functions, etc.)
(*I briefly worked at a fish store where they did so to clean the fresh water tanks on a daily basis- looked terrible for ~5 minutes but they had an integrated industrial sized (really)pump/ filter setup for the entire place that had the tanks looking pristine in 5 minutes time).
I know that water changes are as routine as toothbrushing for some, but just trying to do it correctly for my lil buddy (no industrial setup here! ha!) & am not making assumptions!