hey thats cool, i keep a similar quarantine tank, a constantly running aquarium with a bit of sand and small rounded rocks (more for the surface area than for anything else with some stem plants, aquaiums safe wood and sticks and some salvinia and water lettuceI will just mention that I approach the quarantine tank concept a bit differently than many (perhaps most) aquarists might. I keep a small tank permanently running, with a fairly shallow sand substrate (I have a lot of cories and this really made a difference in settling new fish) and a couple chunks of bogwood for shelter. And it is planted, especially with floating plants--the surface is thick with Water Sprite. This not only means you never have cycling issues (thanks to the plants), but the tank quickly becomes "established" so new fish acquisitions are immediately in an environment that is exactly what they need. And all fish will settle in faster when this can be provided.