i have 2 20lb or more bogwood, and rock, set up as a cave. now do i
want to disturb this formation on a monthly basis to vacuum, or just
vacuum around it? or maybe move it every 6 months or so. the tank is
too small to move the stuff to a different location. thoughts? it is
an oscar tank

Not sure if it's common, but I occasionally move the big things, just to
upset the gravel a bit... I even use a wooden skewer you'd use for shrimp
kabobs, etc, to poke and prod into the gravel that's been under a rock, and
the reason is aenerobic pockets of gas, or air, whichever, so that they can
escape and not buildup to become toxic...

This may not be common practice, but FWIW...

Back to your question.... You don't have to upset stuff if you don't want
to... vacuum around the big things as needed...

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is that better??