spraying chems by the tank should be a concern. windex,airfreshener ect,be sure to clean hands good...clean em again...if you dont have a canopy ,reaching in the tank for somthing and you fish bites you.its just a reaction.and now your light is halfway in the water. zzzzaaaappppp.{saltwater is very conductive} be sure to have a gfi and a loop in you electrical wires.