Obviously, there is a lack of maintenance and upkeep.Other than algae (which is fine) what's wrong with the tank?
If the person who owns this tank lacks the discipline to care for it at this early and simple stage, why should anyone believe that there would be any success when housing the more difficult creatures?
Put an Anemone in this tank and withing two weeks, there will be posts tagged as an emergency about why it looks so terrible and seeking help to save it.