This is my second attempt at having a tank. My first was several years ago and was not advised about the fishless cycling by my pet store and it was a devastating event for me. I felt so bad to have put my fish through it and have them die. I've kept the equipment all this time and decided to give it another shot as I really would love to have fish. I would like to know what type of filter is recommended (ie. under gravel or above). I have a 26 or 30 gallon tank. I plan on getting my supplies on Monday and testing the tank and equipment for a day or two and then start the fishless cycling. Any suggestions on what I should purchase to make this attempt more successful is GREATLY APPRECIATED!