to filter a tank that size since you want to drop the work needed id think if you used a koi type settling chamber or vortex pre filter then most of your solids would be removed before the bio filter,
http://www.koicymru.co.uk/constructb3c.htm
that would mean all you really need to do is open a drain line which would take a few seconds if you have a drain installed.
then install a constant water drip system so you dont need to do water changes.
if you really want to make it effortless you might wana work in a bottom drain
http://www.koiclay.com/diy/pg4.htm
if you put a slight slope in the base towards the drain then your weekly tank work would be open valve drain rubbish scrub algea if you want to
monthly change water filters (if you need them from your tap)
yearly clean bio filter ( this would be after the vortex )
if you really want it effortless