The link that you put on your last post tells it all. I'm just starting a fishless cycle on my new tank and what I learnt from my first tank is that you have to be patient and if you use fish to cycle the tank (as I did) you are putting them under stress, even if they are considered 'hardy'! It's well worth waiting the few weeks because your tank will be a really good place for fish to be and you will have fewer problems in the future. I'm doing the 'add and wait' method. I bought the ammonia from the internet (Jeyes) and I've worked out how many drops to put in using a plastic dropper. Today I put the same number of drips of water into a small plastic measuring cup (like the ones you get with bottles of medicine) so that next time I don't have to laboriously count the drops. I'm writing a diary of the process as suggested by Taffy. Keep in touch if it helps.