This is the lowest-stakes post on the whole board, and it makes every question you ask afterwards easier to answer, because people already know a little about your setup. There is no format. If you want one: What you keep , or that you keep nothing yet and are reading first — both are completely normal here. How long you have been at it. What you are planning next , which is often where the good conversations start. Where you are, roughly. Water hardness and what is available in shops vary enormously by region, and it shapes the advice people give you. Welcome. Genuinely — a forum is only worth reading because people turned up and said something, and this is that. One house rule, and it is the only one that matters: answer the question that was asked, and say when you are not sure. A confident wrong answer costs somebody a fish.