is it all crusted with salt? for the tank - I would just use warm.. really warm water and a sponge. If its really bad I would try to use vinegar (although I am not positive that vinegar dissolves salt) for the filter - depending on what type I would just soak it in really hot water, rinse, and repeat until you feel satisfied. Cichlids can usually take a good amount of salinity - but don't take my word for it, read up on the fish you are going to add. If you can go out and buy one of those devices that measures salinity in water.