Hi- A friend of a friend is wanting me to take down & redo her 100 gal tank. The water is bad & there are only 3 fish left. It needs a new hood/light & the filter hasn't been cleaned in almost a year! The gravel is yuck & the rocks aren't safe either. Where do I begin & what would I charge to drain & reset up this tank? All the supplies will be at her cost. Any help/insight would be greatly appreciated. I just don't want to be in over my head.Thanks much!