I want to dirt my tank but don't know what soil or what minerals to put in the soil. I have read many forums online and I have gotten two main things. Plain Top Soil and Red Clay. The rest of the materials depends on personal preference. This is where I need help. I heard you can make soil better than what is sold in the market unless you get ADA but that is way to expensive for a 75 gallon. What should I put inside the soil beside the clay and any other suggestions before I get started?