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I currently have a 20 gallon freshwater setup and would like to start a separate tank for saltwater. I do not have a lot of money to spend so I am looking at purchasing everything from the forums or aquabid. However, I need help deciding on the equipment to get. I have a Penguin Filter right now and a submersible heater (not sure of the wattage or type). I need recommendations for a filter for a saltwater tank and a decent heater. I know this depends on the size of the tank as well so this brings me to another question. The tank would be a starter tank of sorts that I will only have for another year before moving. Therefore I would like it to be 10 or 20 gallons. I heard it is much more difficult to maintain the correct parameters in a 10 gallon saltwater tank, but how much more difficult is it? I plan to only keep a few seahorses and a clown fish or two in the tank. When I move the freshwater setup will become the main saltwater tank if I get a 10 gallon the the 10 gallon will be used as a quarantine/breeding tank. Is this a good idea or should I go with the 20 gallon from the beginning?