I recently took the plunge from freshwater to marine. I have a ten gallon tank with about 1/2 inch or arganite, and about 4 lbs of live rock with a powerhead in the tank which is attached to a sponge filter. For lighting, I have a 96 Watt 6700 deg K CF light that I used to use for a freshwater planted tank. The tank is stocked with a blue damsel, and a blue legged hermit crab. My question is what I should do next. Which would be more effective: A protein skimmer, or more of the live rock? Which skimmer would be a good one to get, and what would be a good source of live rock. There are so many different kinds, and I don't konw the difference between them.