I have a 15 gallon AIO acrylic tank with HOB skimmer. I plan to make this a frag tank with a pair of clowns. What is the best way to get this up and running and how long will it take? I was planning to not use sand (or should I?) and have cut a piece of eggcrate to fit the bottom so I can put plugs in there. I have my other tanks up and running but don't know if I should use water and or rock from them because I am worried about coraline and acrylic.