My boyfriend has a 25 gallon saltwater tank right now and next year we're going to convert that to a 55 gallon and use the 25 as a sump. I want to buy him all the eqiupment to setup the sump, but I don't want to go buy the wrong things without asking the experts first. I know I need a pump, but what type and how strong should the pump be? My guess is that the water might have to travel a max of 4 1/2 to 5 feet upwards. Also, do I need anything to put in the sump? Live rock? We have a skimmer that goes in the tank, so I thought we'd hide that in the sump, but what else should I get for it? Any particular type of filtration or power heads? I'm really new at this. Any help you guys could give me would be excellent! Thanks!