The old way scraping a tank was to have a wall of rock, food, dead or dieing fish can get trapped around the back of it. If a fish vanishes it usually ends up around the wall. I would have a spike shape (v) of rock coming from the filter end, you can still have hidey holes for fish in there. It will be easier to monitor rather than removing rock all time to find that missing creature or pile of decay food that is giving you loads of algae problems