Vacuuming a sand bed or not That is my question

[IanWR]

To clean or not to clean, that is the question -
Whether 'tis nobler in the tank to suffer
the detritus and phosphate buildup of outrageous substrate
or take up vacuum against a Sea of pollutants
and by removing end them? To purge, to clean -
be done; and by clean, to say we end
the heartache and thousand natural shocks
that sand is heir to? 'Tis a consummation
devoutly to be wished. To purge, to clean.
To clean, perchance to release toxic sulphides; aye there's the rub,
for in that undisturbed substrate, what pollutants may emerge
when we have shovelled out the sand,
must give us pause.