I am looking into converting my 10 gallon into a nano reef. My question is, what is your favorite creature in your nano, 10-15 gallons (fish, shrimp, crab, coral) i want to make this a very interesting and exciting tank. Also i read somehwere a dwarf wartksin angler can be kept in a 10 gallon by itself, but everywhere else says 20 gallon minimum, is it possible?