I'd go for an auto feeder over one of those "weekend feeder block/pyramid" things. They're really easy to set up, can either hang onto the back of the tank or just sit on it, and run off batteries. I've used one for my SW tank once, and no problems with it, even figuring it out without directions. The block/pyramid things don't have much nutritional value, and I've heard they can put some icky stuff in the water.