I have a 10 gallon top fin tank. I was wondering if I could just put salt water in it and change the filter and use the old filter system. it is an aquatec system. It is currently a freshwater tank but I would like to make a nano reef setup out of it for next year. If it is not possible what is the best nano reef tank. I am looking for it to be around 10 or 15 gallons since I am I college student. thanks,